~/dnsniffer/tlds/ac.uk·rank #762
▸ How many .ac.uk domains are registered?
2,830
active .ac.uk domains as of .
# rank #762 of all TLDs ▲ 3 in 30d# all records held: 2,995# snapshots: 19
~/tlds/ac.uk/history·active domains
2,830
active .ac.uk domains on 2026-09-04 · ▲ +2,460 (+664.86%) since 2025-06-30
# y-axis starts at 72.64, 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
▼ -0.63%
-18 domains
90 days
▲ +0.00%
+0 domains
1 year
▲ +5.60%
+150 domains
# faq
- ? How many .ac.uk domains are registered?
- There are 2,830 active .ac.uk domains as of September 4, 2026, according to DNSniffer’s daily count of zone-file and certificate-transparency records.
- ? Is .ac.uk growing or shrinking?
- .ac.uk has grown by 5.60% over the last year (+150 domains).
- ? Where does the .ac.uk 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.uk 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.