ASN and Network Prefixes for TLD Nameservers (2021-10)

On Monday, October 4, 2021, Facebook had BGP advertisements removed for several hours for two networks within the same ASN. These networks were to their four DNS nameserver IPs. This included IPv6 too. This effectively disabled their websites and related services (due to lame delegations resulting in SERVFAILs).

What are the best practices related to this? RFC 2182 says "Secondary servers must be placed at both topologically and geographically dispersed locations on the Internet." NIST requirements say "All authoritative name servers for a zone must be located on different network segments." And IANA's requirements for its authoritative name servers says they must be in at least two topologically-separate origin autonomous systems in the BGP routing table. While it is common for a single organization to have different networks under the same AS number, what is the best practice?

The following table is for all the TLDs to show the count of different ASNs for each IPv4 nameserver (from root server delegations) for the TLD and the count of network prefixes for each too. Sixteen TLDs have IPv4 nameservers from only a single ASN (like Facebook). (For IPv6, there are 48 TLDs with a single ASN for all nameservers.) The most common is two different ASNs and the highest is ten.

Eight TLDs have only a single ASN and single network too for IPv4. (For IPv6, there are 32 TLDs with a single ASN and single network prefix for all nameservers.) The most common is four different networks and again ten networks is the highest.

This table may be sorted by clicking on the headers. (Other tables for most popular ASNs are below too.)

TLD	ASN Count (IPv4)	Network Count (IPv4)
aaa	3	6
aarp	4	4
abarth	2	4
abb	4	4
abbott	2	4
abbvie	4	8
abc	4	4
able	3	6
abogado	4	8
abudhabi	2	4
ac	2	4
academy	2	6
accenture	3	4
accountant	2	6
accountants	2	6
aco	2	3
actor	2	6
ad	4	4
adac	4	4
ads	2	5
adult	2	4
ae	3	4
aeg	3	4
aero	2	5
aetna	3	6
af	2	3
afamilycompany	3	4
afl	2	4
africa	3	3
ag	2	6
agakhan	2	4
agency	2	6
ai	3	4
aig	3	6
airbus	4	4
airforce	2	6
airtel	3	4
akdn	2	4
al	4	4
alfaromeo	2	4
alibaba	2	4
alipay	2	4
allfinanz	4	4
allstate	2	4
ally	2	4
alsace	3	3
alstom	3	3
am	4	4
amazon	4	8
americanexpress	3	6
americanfamily	3	4
amex	2	6
amfam	3	4
amica	3	6
amsterdam	3	3
analytics	3	6
android	2	5
anquan	2	4
anz	2	4
ao	3	3
aol	3	4
apartments	2	6
app	2	5
apple	2	4
aq	3	3
aquarelle	3	3
ar	6	6
arab	2	4
aramco	2	6
archi	2	4
army	2	6
arpa	10	10
art	4	4
arte	3	4
as	3	6
asda	4	4
asia	2	6
associates	2	6
at	6	8
athleta	3	6
attorney	2	6
au	6	9
auction	2	5
audi	2	4
audible	4	8
audio	4	4
auspost	2	4
author	4	8
auto	2	2
autos	4	4
avianca	2	4
aw	4	4
aws	4	8
ax	1	2
axa	3	6
az	2	2
azure	4	4
ba	2	2
baby	4	4
baidu	3	6
banamex	3	6
bananarepublic	3	6
band	2	6
bank	2	6
bar	4	4
barcelona	2	2
barclaycard	3	4
barclays	2	4
barefoot	4	4
bargains	2	6
baseball	3	6
basketball	2	4
bauhaus	2	2
bayern	4	8
bb	2	4
bbc	4	8
bbt	3	4
bbva	4	8
bcg	2	4
bcn	2	2
bd	2	3
be	3	6
beats	2	4
beauty	4	4
beer	4	8
bentley	3	8
berlin	2	3
best	4	4
bestbuy	2	4
bet	2	4
bf	4	4
bg	3	6
bh	4	4
bharti	3	4
bi	4	5
bible	3	6
bid	3	6
bike	2	6
bing	3	4
bingo	2	6
bio	2	4
biz	2	6
bj	6	7
black	2	4
blackfriday	4	4
blockbuster	2	4
blog	4	4
bloomberg	4	4
blue	2	4
bm	2	6
bms	4	4
bmw	4	4
bn	4	4
bnpparibas	2	4
bo	4	4
boats	4	4
boehringer	2	4
bofa	3	4
bom	5	5
bond	4	4
boo	2	5
book	4	8
booking	3	6
bosch	3	4
bostik	3	3
boston	4	8
bot	4	8
boutique	2	6
box	4	4
br	5	5
bradesco	4	8
bridgestone	4	4
broadway	4	8
broker	2	6
brother	2	4
brussels	3	6
bs	2	2
bt	5	5
budapest	4	8
bugatti	2	4
build	4	4
builders	2	6
business	2	6
buy	4	8
buzz	3	6
bv	2	3
bw	3	4
by	5	5
bz	2	6
bzh	3	3
ca	4	4
cab	2	6
cafe	2	6
cal	2	5
call	4	8
calvinklein	3	6
cam	4	4
camera	2	6
camp	2	6
cancerresearch	2	4
canon	2	4
capetown	3	3
capital	2	6
capitalone	3	4
car	4	4
caravan	3	6
cards	2	6
care	2	6
career	4	8
careers	2	6
cars	4	4
casa	5	8
case	4	4
cash	2	6
casino	2	6
cat	6	6
catering	2	6
catholic	2	4
cba	2	4
cbn	3	6
cbre	2	6
cbs	2	4
cc	4	4
cd	2	3
center	2	6
ceo	4	4
cern	2	4
cf	2	4
cfa	3	4
cfd	4	4
cg	3	3
ch	5	6
chanel	3	4
channel	2	5
charity	2	6
chase	3	6
chat	2	6
cheap	2	6
chintai	3	6
christmas	4	4
chrome	2	5
church	2	6
ci	5	5
cipriani	2	4
circle	4	8
cisco	2	6
citadel	2	6
citi	3	6
citic	3	6
city	2	6
cityeats	4	4
ck	2	2
cl	7	7
claims	2	6
cleaning	2	6
click	4	4
clinic	2	6
clinique	2	4
clothing	2	6
cloud	2	4
club	3	6
clubmed	3	4
cm	5	7
cn	5	7
co	2	6
coach	2	6
codes	2	6
coffee	2	6
college	4	4
cologne	3	3
com	3	10
comcast	4	8
commbank	2	4
community	2	6
company	2	6
compare	2	4
computer	2	6
comsec	3	4
condos	2	6
construction	2	6
consulting	2	6
contact	2	6
contractors	2	6
cooking	4	8
cookingchannel	3	4
cool	2	6
coop	4	4
corsica	3	3
country	4	4
coupon	3	6
coupons	2	5
courses	2	4
cpa	2	4
cr	6	6
credit	2	6
creditcard	2	6
creditunion	3	4
cricket	2	6
crown	3	4
crs	3	4
cruise	2	4
cruises	2	6
csc	4	4
cu	5	5
cuisinella	2	4
cv	4	4
cw	4	5
cx	2	3
cy	5	5
cymru	4	8
cyou	4	4
cz	2	4
dabur	2	4
dad	2	5
dance	2	6
data	2	4
date	3	6
dating	2	6
datsun	2	4
day	2	5
dclk	2	5
dds	4	8
de	5	6
deal	4	8
dealer	4	4
deals	2	6
degree	2	6
delivery	2	6
dell	3	6
deloitte	4	4
delta	2	4
democrat	2	6
dental	2	6
dentist	2	6
desi	4	4
design	4	4
dev	2	5
dhl	4	4
diamonds	2	6
diet	4	4
digital	2	6
direct	2	6
directory	2	6
discount	2	6
discover	3	6
dish	2	4
diy	3	4
dj	2	3
dk	7	7
dm	7	8
dnp	2	4
do	5	6
docs	2	5
doctor	2	6
dog	2	6
domains	2	6
dot	2	4
download	3	6
drive	2	5
dtv	2	4
dubai	2	4
duck	4	4
dunlop	2	4
dupont	3	6
durban	3	3
dvag	4	4
dvr	2	4
dz	6	6
earth	3	6
eat	2	5
ec	3	3
eco	2	4
edeka	2	4
edu	3	10
education	2	6
ee	5	5
eg	3	3
email	2	6
emerck	2	4
energy	2	6
engineer	2	6
engineering	2	6
enterprises	2	6
epson	2	4
equipment	2	6
er	2	2
ericsson	4	4
erni	2	2
es	3	5
esq	2	5
estate	2	6
et	1	1
etisalat	4	4
eu	5	5
eurovision	2	2
eus	3	3
events	2	6
exchange	2	6
expert	2	6
exposed	2	6
express	2	6
extraspace	2	4
fage	2	4
fail	2	6
fairwinds	4	4
faith	3	6
family	2	6
fan	2	6
fans	4	4
farm	2	6
farmers	3	6
fashion	4	8
fast	4	8
fedex	2	4
feedback	4	4
ferrari	2	4
ferrero	3	6
fi	9	10
fiat	2	4
fidelity	4	4
fido	2	4
film	2	4
final	5	5
finance	2	6
financial	2	6
fire	4	8
firestone	2	4
firmdale	2	2
fish	2	6
fishing	4	8
fit	5	8
fitness	2	6
fj	2	3
fk	2	2
flickr	3	6
flights	2	6
flir	3	6
florist	2	6
flowers	4	4
fly	2	5
fm	5	6
fo	4	4
foo	2	5
food	3	4
foodnetwork	4	4
football	2	6
ford	3	6
forex	2	6
forsale	2	6
forum	4	4
foundation	2	6
fox	2	6
fr	4	4
free	4	8
fresenius	4	4
frl	4	4
frogans	2	4
frontdoor	3	4
frontier	3	6
ftr	3	6
fujitsu	2	4
fun	5	5
fund	2	6
furniture	2	6
futbol	2	6
fyi	2	6
ga	2	4
gal	2	2
gallery	2	6
gallo	3	4
gallup	2	4
game	4	4
games	2	6
gap	3	6
garden	4	8
gay	4	4
gb	2	2
gbiz	2	5
gd	4	4
gdn	2	3
ge	4	5
gea	2	3
gent	4	4
genting	4	4
george	3	4
gf	1	2
gg	3	6
ggee	2	4
gh	2	3
gi	2	6
gift	4	4
gifts	2	6
gives	2	5
giving	2	4
gl	3	4
glade	4	4
glass	2	6
gle	2	5
global	2	4
globo	5	5
gm	2	2
gmail	2	5
gmbh	2	6
gmo	2	4
gmx	2	2
gn	3	3
godaddy	2	4
gold	2	6
goldpoint	2	4
golf	2	6
goo	3	4
goodyear	2	4
goog	2	5
google	2	5
gop	4	8
got	4	8
gov	3	4
gp	4	4
gq	2	4
gr	5	5
grainger	3	6
graphics	2	6
gratis	2	6
green	2	4
gripe	2	6
grocery	4	4
group	2	6
gs	2	3
gt	6	6
gu	3	3
guardian	4	4
gucci	4	8
guge	2	5
guide	2	6
guitars	4	4
guru	2	6
gw	3	3
gy	2	2
hair	4	4
hamburg	2	3
hangout	2	5
haus	2	6
hbo	3	6
hdfc	2	4
hdfcbank	2	4
health	2	6
healthcare	2	6
help	4	4
helsinki	2	4
here	2	5
hermes	2	4
hgtv	3	4
hiphop	4	4
hisamitsu	2	4
hitachi	3	4
hiv	4	4
hk	6	7
hkt	2	4
hm	2	2
hn	3	3
hockey	2	6
holdings	2	6
holiday	2	6
homedepot	2	4
homegoods	3	6
homes	4	4
homesense	3	6
honda	2	4
horse	4	8
hospital	2	6
host	5	5
hosting	4	4
hot	4	8
hoteles	2	6
hotels	3	6
hotmail	4	4
house	2	6
how	2	5
hr	3	3
hsbc	3	6
ht	3	3
hu	6	7
hughes	2	4
hyatt	3	6
hyundai	3	4
ibm	2	4
icbc	2	4
ice	4	4
icu	4	4
id	1	4
ie	5	6
ieee	3	6
ifm	2	2
ikano	2	3
il	6	6
im	2	4
imamat	2	4
imdb	5	8
immo	2	6
immobilien	2	6
in	2	6
inc	4	4
industries	2	6
infiniti	4	4
info	2	6
ing	2	5
ink	4	4
institute	2	6
insurance	3	6
insure	2	6
int	5	6
international	2	6
intuit	3	6
investments	2	6
io	2	4
ipiranga	3	6
iq	3	3
ir	4	5
irish	2	6
is	5	5
ismaili	2	4
ist	2	4
istanbul	2	4
it	4	5
itau	2	6
itv	2	4
jaguar	4	4
java	3	4
jcb	2	4
je	3	5
jeep	2	4
jetzt	2	6
jewelry	2	6
jio	2	4
jll	2	4
jm	4	4
jmp	2	6
jnj	3	6
jo	3	4
jobs	4	8
joburg	3	3
jot	4	8
joy	4	8
jp	8	8
jpmorgan	3	6
jprs	4	4
juegos	4	4
juniper	3	4
kaufen	2	6
kddi	3	4
ke	5	5
kerryhotels	3	4
kerrylogistics	3	4
kerryproperties	3	4
kfh	4	4
kg	2	2
kh	3	3
ki	1	1
kia	2	4
kim	2	4
kinder	3	6
kindle	5	8
kitchen	2	6
kiwi	2	2
km	2	2
kn	2	3
koeln	3	3
komatsu	3	4
kosher	2	4
kp	1	1
kpmg	3	6
kpn	4	4
kr	6	6
krd	2	4
kred	4	4
kuokgroup	4	4
kw	5	5
ky	4	4
kyoto	2	4
kz	2	2
la	2	2
lacaixa	2	2
lamborghini	2	4
lamer	2	4
lancaster	3	3
lancia	2	4
land	2	6
landrover	3	4
lanxess	3	6
lasalle	2	4
lat	4	6
latino	2	4
latrobe	2	4
law	4	8
lawyer	2	6
lb	6	6
lc	2	6
lds	2	4
lease	2	6
leclerc	3	3
lefrak	3	4
legal	2	6
lego	3	4
lexus	4	4
lgbt	2	4
li	5	6
lidl	4	4
life	2	6
lifeinsurance	3	6
lifestyle	3	4
lighting	2	6
like	4	8
lilly	3	6
limited	2	6
limo	2	6
lincoln	2	6
linde	4	4
link	4	4
lipsy	4	4
live	2	6
living	4	4
lixil	3	4
lk	7	8
llc	2	4
llp	4	4
loan	3	6
loans	2	6
locker	2	4
locus	4	8
loft	3	6
lol	4	4
london	4	4
lotte	3	4
lotto	2	4
love	4	4
lpl	4	4
lplfinancial	4	4
lr	3	3
ls	3	4
lt	3	6
ltd	2	6
ltda	2	4
lu	5	6
lundbeck	3	4
luxe	4	8
luxury	4	4
lv	5	7
ly	4	5
ma	5	5
macys	3	4
madrid	2	2
maif	3	4
maison	2	6
makeup	4	4
man	2	2
management	2	6
mango	2	2
map	2	5
market	2	6
marketing	2	6
markets	2	6
marriott	2	4
marshalls	3	6
maserati	2	4
mattel	3	6
mba	2	6
mc	3	3
mckinsey	2	4
md	3	4
me	2	5
med	4	8
media	2	6
meet	2	5
melbourne	2	4
meme	2	5
memorial	2	6
men	2	4
menu	2	4
merckmsd	4	4
mg	4	5
mh	2	2
miami	4	8
microsoft	3	4
mil	1	6
mini	4	4
mint	3	6
mit	2	4
mitsubishi	3	4
mk	4	4
ml	2	4
mlb	3	6
mls	2	2
mm	3	4
mma	3	3
mn	6	10
mo	3	4
mobi	2	6
mobile	2	4
moda	2	6
moe	3	6
moi	4	8
mom	4	4
monash	2	4
money	2	6
monster	4	4
mormon	2	4
mortgage	2	6
moscow	3	4
moto	3	6
motorcycles	4	4
mov	2	5
movie	2	6
mp	2	2
mq	1	2
mr	5	5
ms	1	1
msd	3	4
mt	3	4
mtn	4	8
mtr	2	4
mu	4	4
museum	3	3
mutual	3	6
mv	2	3
mw	6	7
mx	4	6
my	6	6
mz	4	4
na	4	4
nab	3	4
nagoya	3	4
name	3	4
natura	5	5
navy	2	6
nba	2	6
nc	3	3
ne	2	2
nec	2	4
net	4	10
netbank	2	4
netflix	3	6
network	2	6
neustar	2	6
new	2	5
news	2	6
next	3	4
nextdirect	3	4
nexus	2	5
nf	2	3
nfl	3	6
ng	3	3
ngo	2	6
nhk	2	4
ni	4	5
nico	3	4
nike	3	6
nikon	4	4
ninja	2	6
nissan	2	4
nissay	4	4
nl	3	3
no	5	6
nokia	2	4
northwesternmutual	2	6
norton	3	4
now	4	8
nowruz	3	4
nowtv	2	4
np	5	5
nr	3	3
nra	2	4
nrw	2	2
ntt	3	3
nu	5	6
nyc	2	6
nz	6	7
obi	4	4
observer	2	6
off	4	4
office	3	6
okinawa	4	4
olayan	2	4
olayangroup	2	4
oldnavy	3	6
ollo	2	4
om	3	6
omega	4	4
one	2	4
ong	2	6
onl	2	4
online	5	5
ooo	4	4
open	3	6
oracle	3	4
orange	3	4
org	2	6
organic	2	4
origins	2	4
osaka	3	6
otsuka	2	4
ott	2	4
ovh	3	3
pa	4	4
page	2	5
panasonic	3	4
paris	3	3
pars	3	4
partners	2	6
parts	2	6
party	3	6
passagens	3	6
pay	4	8
pccw	2	4
pe	4	4
pet	2	4
pf	1	1
pfizer	2	6
pg	3	4
ph	4	4
pharmacy	4	8
phd	2	5
philips	2	4
phone	2	4
photo	4	4
photography	2	6
photos	2	6
physio	2	4
pics	4	4
pictet	4	4
pictures	2	6
pid	4	4
pin	4	8
ping	3	6
pink	2	4
pioneer	2	4
pizza	2	6
pk	4	4
pl	9	9
place	2	6
play	2	5
playstation	2	4
plumbing	2	6
plus	2	6
pm	4	4
pn	4	5
pnc	2	4
pohl	4	4
poker	2	4
politie	3	3
porn	2	4
post	1	4
pr	4	8
pramerica	3	6
praxi	2	6
press	5	5
prime	4	8
pro	2	6
prod	2	5
productions	2	6
prof	2	5
progressive	2	4
promo	2	4
properties	2	6
property	4	4
protection	4	4
pru	3	6
prudential	3	6
ps	7	7
pt	7	8
pub	2	6
pw	5	6
pwc	2	4
py	5	5
qa	5	7
qpon	4	4
quebec	2	2
quest	4	4
qvc	3	6
racing	3	6
radio	2	2
raid	3	4
re	4	4
read	4	8
realestate	4	8
realtor	4	8
realty	2	6
recipes	2	6
red	2	4
redstone	2	4
redumbrella	2	4
rehab	2	6
reise	2	6
reisen	2	6
reit	4	4
reliance	2	4
ren	3	6
rent	4	4
rentals	2	6
repair	2	6
report	2	6
republican	2	6
rest	4	4
restaurant	2	6
review	3	6
reviews	2	6
rexroth	3	4
rich	2	4
richardli	2	4
ricoh	3	4
ril	2	4
rio	5	5
rip	2	6
ro	4	5
rocher	2	6
rocks	2	6
rodeo	4	8
rogers	2	4
room	4	8
rs	5	5
rsvp	2	5
ru	2	5
rugby	3	4
ruhr	2	2
run	2	6
rw	4	4
rwe	4	4
ryukyu	3	4
sa	5	7
saarland	4	4
safe	5	8
safety	2	6
sakura	3	3
sale	2	6
salon	2	6
samsclub	3	4
samsung	4	4
sandvik	2	4
sandvikcoromant	3	4
sanofi	3	4
sap	2	2
sarl	2	6
sas	3	6
save	4	8
saxo	2	4
sb	2	3
sbi	2	4
sbs	4	4
sc	3	7
sca	3	4
scb	4	4
schaeffler	2	3
schmidt	3	4
scholarships	2	4
school	2	6
schule	2	6
schwarz	4	4
science	3	6
scjohnson	4	4
scot	2	2
sd	5	6
se	8	10
search	2	5
seat	2	2
secure	4	8
security	4	4
seek	2	4
select	2	4
sener	4	4
services	2	6
ses	3	4
seven	2	4
sew	2	4
sex	2	4
sexy	4	4
sfr	4	4
sg	5	5
sh	2	4
shangrila	3	4
sharp	2	4
shaw	2	4
shell	4	4
shia	3	4
shiksha	2	4
shoes	2	6
shop	2	4
shopping	2	6
shouji	2	4
show	2	6
showtime	2	4
si	7	7
silk	4	8
sina	2	4
singles	2	5
site	5	5
sj	2	3
sk	5	7
ski	2	4
skin	4	4
sky	3	4
skype	3	6
sl	2	2
sling	2	4
sm	3	3
smart	4	4
smile	4	8
sn	4	4
sncf	3	3
so	2	2
soccer	2	6
social	2	6
softbank	3	4
software	2	6
sohu	3	6
solar	2	6
solutions	2	6
song	2	6
sony	2	4
soy	2	5
spa	2	4
space	5	5
sport	3	3
spot	4	8
sr	1	1
srl	2	4
ss	3	3
st	3	4
stada	2	4
staples	3	6
star	2	4
statebank	2	4
statefarm	3	6
stc	4	4
stcgroup	4	4
stockholm	2	4
storage	4	4
store	5	5
stream	3	6
studio	2	6
study	2	4
style	2	6
su	2	5
sucks	2	4
supplies	2	6
supply	2	6
support	2	6
surf	4	8
surgery	2	6
suzuki	3	4
sv	7	8
swatch	4	4
swiftcover	3	6
swiss	3	3
sx	2	2
sy	3	3
sydney	3	4
systems	2	6
sz	3	3
tab	2	4
taipei	3	6
talk	4	8
taobao	3	6
target	2	6
tatamotors	4	4
tatar	2	5
tattoo	4	4
tax	2	6
taxi	2	6
tc	5	5
tci	3	4
td	3	4
tdk	3	6
team	2	6
tech	5	5
technology	2	6
tel	4	8
temasek	2	4
tennis	2	6
teva	3	6
tf	4	4
tg	5	6
th	5	5
thd	2	4
theater	2	6
theatre	4	4
tiaa	4	4
tickets	4	4
tienda	2	6
tiffany	4	4
tips	2	5
tires	2	6
tirol	3	3
tj	4	4
tjmaxx	3	6
tjx	3	6
tk	2	4
tkmaxx	3	6
tl	2	3
tm	4	7
tmall	3	6
tn	5	5
to	4	7
today	2	6
tokyo	2	4
tools	2	6
top	3	6
toray	2	4
toshiba	2	4
total	3	3
tours	2	5
town	2	6
toyota	2	4
toys	2	6
tr	5	5
trade	3	6
trading	2	6
training	2	6
travel	2	6
travelchannel	3	4
travelers	2	4
travelersinsurance	2	4
trust	4	4
trv	2	4
tt	4	4
tube	3	6
tui	4	4
tunes	4	8
tushu	4	8
tv	3	4
tvs	2	4
tw	8	10
tz	6	6
ua	4	4
ubank	4	4
ubs	4	4
ug	5	5
uk	4	8
unicom	3	6
university	2	6
uno	5	5
uol	5	5
ups	2	4
us	2	6
uy	6	7
uz	6	7
va	4	4
vacations	2	6
vana	4	4
vanguard	4	4
vc	2	6
ve	4	5
vegas	2	4
ventures	2	6
verisign	3	4
versicherung	2	3
vet	2	6
vg	4	4
vi	2	2
viajes	2	6
video	2	6
vig	2	4
viking	2	4
villas	2	6
vin	2	6
vip	5	8
virgin	4	8
visa	3	4
vision	2	6
viva	4	4
vivo	2	6
vlaanderen	3	6
vn	6	6
vodka	4	8
volkswagen	2	4
volvo	4	4
vote	2	4
voting	2	4
voto	2	4
voyage	2	6
vu	2	4
vuelos	3	6
wales	4	8
walmart	3	4
walter	3	4
wang	3	6
wanggou	4	8
watch	2	6
watches	2	4
weather	3	6
weatherchannel	3	6
webcam	3	6
weber	3	4
website	4	4
wed	5	8
wedding	4	8
weibo	2	4
weir	3	4
wf	4	4
whoswho	3	3
wien	3	3
wiki	4	4
williamhill	2	6
win	3	6
windows	3	4
wine	2	6
winners	3	6
wme	4	4
wolterskluwer	2	4
woodside	2	4
work	4	8
works	2	6
world	2	6
wow	4	8
ws	2	4
wtc	3	4
wtf	2	6
xbox	4	4
xerox	3	4
xfinity	4	8
xihuan	1	2
xin	2	4
xn--11b4c3d	3	4
xn--1ck2e1b	2	6
xn--1qqw23a	2	5
xn--2scrj9c	2	6
xn--30rr7y	3	6
xn--3bst00m	3	6
xn--3ds443g	2	4
xn--3e0b707e	6	6
xn--3hcrj9c	2	6
xn--3oq18vl8pn36a	2	4
xn--3pxu8k	3	4
xn--42c2d9a	3	4
xn--45br5cyl	2	6
xn--45brj9c	2	6
xn--45q11c	3	6
xn--4gbrim	2	4
xn--54b7fta0cc	2	3
xn--55qw42g	2	5
xn--55qx5d	2	5
xn--5su34j936bgsg	4	4
xn--5tzm5g	2	4
xn--6frz82g	2	4
xn--6qq986b3xl	2	5
xn--80adxhks	3	4
xn--80ao21a	2	2
xn--80aqecdr1a	3	4
xn--80asehdb	2	2
xn--80aswg	2	2
xn--8y0a063a	3	6
xn--90a3ac	5	5
xn--90ae	3	6
xn--90ais	5	5
xn--9dbq2a	3	4
xn--9et52u	3	6
xn--9krt00a	2	4
xn--b4w605ferd	2	4
xn--bck1b9a5dre4c	2	6
xn--c1avg	2	4
xn--c2br7g	3	4
xn--cck2b3b	2	6
xn--cckwcxetd	4	8
xn--cg4bki	4	4
xn--clchc0ea0b2g2a9gcd	5	5
xn--czr694b	3	6
xn--czrs0t	2	6
xn--czru2d	3	6
xn--d1acj3b	2	5
xn--d1alf	3	3
xn--e1a4c	5	5
xn--eckvdtc9d	2	6
xn--efvy88h	3	6
xn--fct429k	3	6
xn--fhbei	4	4
xn--fiq228c5hs	2	4
xn--fiq64b	3	6
xn--fiqs8s	4	7
xn--fiqz9s	4	7
xn--fjq720a	2	6
xn--flw351e	2	5
xn--fpcrj9c3d	2	6
xn--fzc2c9e2c	6	7
xn--fzys8d69uvgm	2	4
xn--g2xx48c	3	6
xn--gckr3f0f	3	6
xn--gecrj9c	2	6
xn--gk3at1e	3	6
xn--h2breg3eve	2	6
xn--h2brj9c	2	6
xn--h2brj9c8c	2	6
xn--hxt814e	2	5
xn--i1b6b1a6a2e	2	4
xn--imr513n	3	6
xn--io0a7i	2	5
xn--j1aef	3	4
xn--j1amh	3	3
xn--j6w193g	7	8
xn--jlq480n2rg	4	8
xn--jlq61u9w7b	2	4
xn--jvr189m	2	6
xn--kcrx77d1x4a	2	4
xn--kprw13d	6	6
xn--kpry57d	6	6
xn--kput3i	2	4
xn--l1acc	2	2
xn--lgbbat1ad8j	3	3
xn--mgb9awbf	4	6
xn--mgba3a3ejt	2	6
xn--mgba3a4f16a	3	3
xn--mgba7c0bbn0a	2	4
xn--mgbaakc7dvf	4	4
xn--mgbaam7a8h	2	3
xn--mgbab2bd	2	2
xn--mgbah1a3hjkrd	5	5
xn--mgbai9azgqp6j	1	1
xn--mgbayh7gpa	3	4
xn--mgbbh1a	2	6
xn--mgbbh1a71e	2	6
xn--mgbc0a9azcg	4	4
xn--mgbca7dzdo	2	4
xn--mgbcpq6gpa1a	4	4
xn--mgberp4a5d4ar	5	7
xn--mgbgu82a	2	6
xn--mgbi4ecexp	3	4
xn--mgbpl2fh	5	5
xn--mgbt3dhd	3	4
xn--mgbtx2b	1	1
xn--mgbx4cd0ab	6	6
xn--mix891f	3	4
xn--mk1bu44c	4	4
xn--mxtq1m	4	4
xn--ngbc5azd	2	4
xn--ngbe9e0a	4	4
xn--ngbrx	2	4
xn--node	3	5
xn--nqv7f	2	4
xn--nqv7fs00ema	2	4
xn--nyqy26a	2	4
xn--o3cw4h	4	4
xn--ogbpf8fl	3	3
xn--otu796d	3	6
xn--p1acf	3	4
xn--p1ai	2	5
xn--pgbs0dh	5	5
xn--pssy2u	4	4
xn--q7ce6a	4	4
xn--q9jyb4c	2	5
xn--qcka1pmc	2	5
xn--qxa6a	5	5
xn--qxam	4	4
xn--rhqv96g	2	4
xn--rovu88b	3	6
xn--rvc1e0am3e	2	6
xn--s9brj9c	3	6
xn--ses554g	3	6
xn--t60b56a	3	4
xn--tckwe	3	4
xn--tiq49xqyj	2	4
xn--unup4y	2	6
xn--vermgensberater-ctb	4	4
xn--vermgensberatung-pwb	4	4
xn--vhquv	2	6
xn--vuq861b	1	2
xn--w4r85el8fhu5dnra	4	4
xn--w4rs40l	3	4
xn--wgbh1c	3	4
xn--wgbl6a	5	7
xn--xhq521b	2	5
xn--xkc2al3hye2a	6	7
xn--xkc2dl3a5ee0h	2	6
xn--y9a3aq	4	4
xn--yfro4i67o	4	4
xn--ygbi2ammx	3	4
xn--zfr164b	2	5
xxx	2	4
xyz	4	4
yachts	4	4
yahoo	3	4
yamaxun	4	8
yandex	4	4
ye	2	2
yodobashi	3	4
yoga	4	8
yokohama	3	4
you	5	8
youtube	2	5
yt	4	4
yun	2	4
za	3	3
zappos	4	8
zara	2	4
zero	3	6
zip	2	5
zm	2	2
zone	2	6
zuerich	4	4
zw	3	3
TLD	ASN Count	Network Count

Most Common ASN Networks

For all the TLDs, the fifteen most common ASN network prefix pairs are:

Rank	Count	ASN	Network
1	118	AS42	204.61.216.0/23
2	113	AS60890	185.24.64.0/24
3	113	AS199330	194.169.218.0/24
4	110	AS201304	212.18.248.0/24
5	110	AS201303	212.18.249.0/24
6	106	AS397233	37.209.196.0/24
7	102	AS397235	37.209.194.0/24
8	98	AS397235	37.209.192.0/24
9	94	AS397235	37.209.198.0/24
10	92	AS397235	156.154.158.0/24
11	92	AS397235	156.154.157.0/24
12	92	AS397235	156.154.156.0/24
13	92	AS397235	156.154.145.0/24
14	92	AS397233	156.154.144.0/24
15	92	AS397219	156.154.159.0/24

Most Common ASNs

For all the TLDs, the fifteen most common ASNs are:

Rank	Count	ASN
1	1552	AS12041
2	886	AS397235
3	695	AS207266
4	344	AS397231
5	331	AS43519
6	283	AS397233
7	184	AS15169
8	162	AS42
9	157	AS397219
10	148	AS397215
11	142	AS396574
12	113	AS60890
13	113	AS199330
14	110	AS201304
15	110	AS201303

This data was collected via our comprehensive DNS audit suite, which covers over 100 checks based on IETF RFC specifications and best practices, government requirements, and registry guidelines. It has identified hundreds of thousands of mistakes (including lame delegations, protocol mistakes, typos, security issues, and more) from research of Fortune 500, S&P Global 100 Banks, US government, TLDs, and EDU domains. What do you use to check your DNS?

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