Check-Host.cc

Top-Level Domain

.co

Aggregated statistics for the top-level domain

Apex domains
1,505,291
we've enumerated
Subdomains seen
3,583,809
CT + DNS + brute
TLS certs
23,446
naming .co
Hosting ASNs
15
distinct origins

Domain Distribution

Apex domains with the most known subdomains — large orgs, telecoms, hosters.
Apex Subdomains
sealights.co 22,338
incaptest.co 13,092
gofreshusa.co 7,991
rdpa.co 7,858
remotexs.co 7,086
twinbash.co 5,720
palapa.co 5,192
djg1.co 4,979
nliven.co 4,804
goodarrow.co 4,525
orimi.co 4,241
viding.co 4,165
webdemodesigns.co 3,883
webmai.co 3,399
sium.co 3,293
hbstf.co 2,903
ujetdev.co 2,691
roi.co 2,586
firebaseapp.co 2,556
000.co 2,541
games.co 2,450
douyin.co 2,399
nextera.co 2,233
cn.co 1,994
modento.co 1,971
tv.co 1,863
tenderly.co 1,850
weblium.co 1,829
rz.co 1,824
bb88.co 1,763
to.co 1,732
ncr.co 1,712
ltd.co 1,520
unicart4u.co 1,495
corp.co 1,482
xd.co 1,473
selfhost.co 1,457
s1search.co 1,440
petfndr.co 1,394
school-time.co 1,349
unblocksites.co 1,338
alipay.co 1,334
be-webs.co 1,302
dzh.co 1,300
de.co 1,293
minly.co 1,280
efficientorbit.co 1,248
bamboohr.co 1,247
appboxes.co 1,221
brushd.co 1,185

Top Certificate Issuers

Issuer (CA) Certs
Let's Encrypt 8,099
Amazon 6,836
Sectigo 1,179
DigiCert 871
WR3 805
GoDaddy 768
YR1 610
YR2 599
Cloudflare 481
YE2 468
YE1 467
GlobalSign 335
ZeroSSL 142
Certum 57
GoDaddy (Starfield) 54

Top Hosting ASNs

ASN Name .co domains
AS16509 Amazon.com 331,707
AS13335 Cloudflare 179,589
AS206834 44,521
AS47846 39,030
AS396982 Google Cloud 30,020
AS53831 SQUARESPACE 27,554
AS133618 26,913
AS61969 19,639
AS47583 Hostinger International 18,527
AS20940 Akamai Technologies 17,047
AS46606 Endurance International Group, Inc 16,261
AS14061 DigitalOcean 16,239
AS24940 Hetzner Online 14,263
AS40034 Confluence Networks 13,841
AS14618 Amazon AES 11,946

Tech-Stack Distribution

No Wappalyzer detections

Body-fetcher hasn't covered enough .co sites yet for stack patterns to emerge.

Most-resolved apex domains

Apexes resolving to the most distinct A/AAAA records — popularity proxy.

Threat-intel hits

Feed Category Domains
openphish phishing 67
ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.