Top-Level Domain

.ac

Aggregated statistics for the top-level domain

Apex domains

9,873

we've enumerated

Subdomains seen

47,710

CT + DNS + brute

TLS certs

454

naming .ac

Hosting ASNs

—

distinct origins

Domain Distribution

Apex domains with the most known subdomains — large orgs, telecoms, hosters.

Apex	Subdomains
gel.ac	3,737
wildgoose.ac	1,621
thai.ac	961
brookes.ac	949
doc.ac	875
remote.ac	790
polygon.ac	589
nios.ac	451
credit.ac	419
ipb.ac	203
ani.ac	199
adu.ac	199
que.ac	176
biotr.ac	174
ccc.ac	168
1it.ac	152
ube.ac	151
umi.ac	145
uns.ac	138
kln.ac	134
sums.ac	133
iisc.ac	129
shu.ac	128
una.ac	126
sci-hub.ac	123
kvs.ac	114
solarmovie.ac	112
cloud.ac	108
kaist.ac	102
vps.ac	93
strath.ac	92
110v.ac	89
samarth.ac	89
tums.ac	87
120v.ac	87
movie.ac	82
onl.ac	82
msu.ac	81
mmu.ac	78
unpas.ac	75
trades.ac	73
wac.ac	73
wsu.ac	72
window.ac	71
jmi.ac	71
najm.ac	70
westwerk.ac	67
ether.ac	67
uwc.ac	67
zz.ac	66

Top Certificate Issuers

Issuer (CA)	Certs
Let's Encrypt	138
Amazon	96
YR2	21
YE2	20
YR1	20
Sectigo	19
YE1	14
Cloudflare	11
DigiCert	11
WR3	7
GlobalSign	6
GoDaddy	5
mgt-subCA	2
ZeroSSL	2
nova-amd-nl-3-v-3-6602996-504195-main.vps.ac	1

Top Hosting ASNs

No hosting attribution yet

Forward-DNS crawler hasn't resolved enough .ac apexes to BGP-attributable IPs.

Tech-Stack Distribution

No Wappalyzer detections

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

Threat-intel hits

Feed	Category	Domains
openphish	phishing	2

ℹ Coverage will improve significantly once CZDS zone-file access is granted for this TLD.