~/dnsniffer/tlds/ac·rank #380
▸ How many .ac domains are registered?
16,904
active .ac domains as of .
# rank #380 of all TLDs ▲ 3 in 30d# all records held: 20,684# snapshots: 60
~/tlds/ac/history·active domains
16,904
active .ac domains on 2026-10-15 · ▲ +16,493 (+4,012.90%) since 2025-06-30
# y-axis starts at 0, not zero - domain counts move by fractions of a percent a day. Dashed segments are estimated: reconstructed from certificate first-seen dates before daily snapshots began, not measured on the day.
# change over time
30 days
▲ +7.82%
+1,226 domains
90 days
▼ -0.60%
-102 domains
1 year
▲ +48.55%
+5,525 domains
# faq
- ? How many .ac domains are registered?
- There are 16,904 active .ac domains as of October 15, 2026, according to DNSniffer’s daily count of zone-file and certificate-transparency records.
- ? Is .ac growing or shrinking?
- .ac has grown by 48.55% over the last year (+5,525 domains).
- ? Where does the .ac domain count come from?
- We ingest ICANN CZDS zone files and Certificate Transparency logs continuously and snapshot the per-TLD count once a day. A .ac domain is counted as active if it appeared in a zone file in the last 2 days, or - where no zone file is published - if a certificate was issued for it in the last 12 months.