~/dnsniffer/tlds/k12.co.us·rank #2,430
▸ How many .k12.co.us domains are registered?
37
active .k12.co.us domains as of .
# rank #2,430 of all TLDs ▼ 10 in 30d# all records held: 41# snapshots: 19
~/tlds/k12.co.us/history·active domains
37
active .k12.co.us domains on 2026-09-04 · ▲ +30 (+428.57%) since 2025-06-30
# y-axis starts at 3.28, 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
▼ -2.63%
-1 domains
90 days
▼ -2.63%
-1 domains
1 year
▲ +2.78%
+1 domains
# faq
- ? How many .k12.co.us domains are registered?
- There are 37 active .k12.co.us domains as of September 4, 2026, according to DNSniffer’s daily count of zone-file and certificate-transparency records.
- ? Is .k12.co.us growing or shrinking?
- .k12.co.us has grown by 2.78% over the last year (+1 domains).
- ? Where does the .k12.co.us 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 .k12.co.us 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.