Check-Host.cc

Top-Level Domain

.co

Aggregated statistics for the top-level domain

Apex domains
1,507,847
we've enumerated
Subdomains seen
3,593,542
CT + DNS + brute
TLS certs
23,473
naming .co
Hosting ASNs
15
distinct origins

Domain Distribution

Apex domains with the most known subdomains — large orgs, telecoms, hosters.
Apex Subdomains
sealights.co 22,357
incaptest.co 13,168
gofreshusa.co 8,026
rdpa.co 7,887
remotexs.co 7,186
twinbash.co 5,784
palapa.co 5,192
djg1.co 4,979
nliven.co 4,804
goodarrow.co 4,541
orimi.co 4,262
viding.co 4,168
webdemodesigns.co 3,883
webmai.co 3,418
sium.co 3,293
hbstf.co 2,924
ujetdev.co 2,763
roi.co 2,588
firebaseapp.co 2,561
000.co 2,542
games.co 2,452
douyin.co 2,412
nextera.co 2,270
cn.co 1,998
modento.co 1,974
tv.co 1,865
tenderly.co 1,850
weblium.co 1,829
rz.co 1,826
bb88.co 1,763
to.co 1,734
ncr.co 1,712
ltd.co 1,520
unicart4u.co 1,495
corp.co 1,482
xd.co 1,473
selfhost.co 1,466
s1search.co 1,442
petfndr.co 1,396
school-time.co 1,351
unblocksites.co 1,338
alipay.co 1,335
be-webs.co 1,302
dzh.co 1,301
de.co 1,293
minly.co 1,280
efficientorbit.co 1,248
bamboohr.co 1,248
appboxes.co 1,221
brushd.co 1,187

Top Certificate Issuers

Issuer (CA) Certs
Let's Encrypt 8,103
Amazon 6,838
Sectigo 1,180
DigiCert 872
WR3 809
GoDaddy 768
YR1 614
YR2 602
Cloudflare 482
YE2 470
YE1 469
GlobalSign 336
ZeroSSL 142
Certum 57
cPanel, Inc. Certification Authority 54

Top Hosting ASNs

ASN Name .co domains
AS16509 Amazon.com 332,175
AS13335 Cloudflare 180,153
AS206834 44,801
AS47846 39,059
AS396982 Google Cloud 30,094
AS53831 SQUARESPACE 27,647
AS133618 26,988
AS61969 19,682
AS47583 Hostinger International 18,605
AS20940 Akamai Technologies 17,071
AS46606 Endurance International Group, Inc 16,311
AS14061 DigitalOcean 16,302
AS24940 Hetzner Online 14,286
AS40034 Confluence Networks 13,917
AS14618 Amazon AES 11,970

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.