dnsniffer.com
sign inget started→
~/dnsniffer/tlds/phd·rank #636

▸ How many .phd domains are registered?

5,134

active .phd domains as of .

# rank #636 of all TLDs ▼ 3 in 30d# all records held: 6,192# snapshots: 59
search .phd domains download the .phd dataset
~/tlds/phd/history·active domains
5,134
active .phd domains on 2026-10-14 · ▲ +1,570 (+44.05%) since 2025-06-30
3.4K3.9K4.4K4.8K5.3K2025-06-30: 3,564 active2025-07-31: 3,641 active2025-08-31: 3,642 active2025-09-30: 3,642 active2025-10-31: 3,642 active2025-11-30: 3,642 active2025-12-31: 3,728 active2026-01-31: 3,765 active2026-02-28: 3,765 active2026-03-31: 3,765 active2026-04-30: 4,559 active2026-05-31: 4,755 active2026-06-30: 4,880 active2026-07-31: 4,990 active2026-08-31: 4,990 active2026-09-01: 4,984 active2026-09-02: 4,986 active2026-09-03: 4,979 active2026-09-04: 4,990 active2026-09-05: 4,995 active2026-09-06: 4,997 active2026-09-07: 4,988 active2026-09-08: 5,000 active2026-09-09: 5,001 active2026-09-10: 5,003 active2026-09-11: 5,014 active2026-09-12: 5,012 active2026-09-13: 5,022 active2026-09-14: 5,025 active2026-09-15: 5,024 active2026-09-16: 5,023 active2026-09-17: 5,035 active2026-09-18: 5,034 active2026-09-19: 5,045 active2026-09-20: 5,043 active2026-09-21: 5,043 active2026-09-22: 5,051 active2026-09-23: 5,049 active2026-09-24: 5,055 active2026-09-25: 5,058 active2026-09-26: 5,061 active2026-09-27: 5,059 active2026-09-28: 5,062 active2026-09-29: 5,066 active2026-09-30: 5,075 active2026-10-01: 5,072 active2026-10-02: 5,087 active2026-10-03: 5,089 active2026-10-04: 5,089 active2026-10-05: 5,092 active2026-10-06: 5,106 active2026-10-07: 5,121 active2026-10-08: 5,119 active2026-10-09: 5,122 active2026-10-10: 5,127 active2026-10-11: 5,136 active2026-10-12: 5,132 active2026-10-13: 5,133 active2026-10-14: 5,134 active2025-06-302026-10-14

# y-axis starts at 3.4K, 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
▲ +2.17%
+109 domains
90 days
▲ +5.20%
+254 domains
1 year
▲ +40.97%
+1,492 domains
# faq
? How many .phd domains are registered?
There are 5,134 active .phd domains as of October 14, 2026, according to DNSniffer’s daily count of zone-file and certificate-transparency records.
? Is .phd growing or shrinking?
.phd has grown by 40.97% over the last year (+1,492 domains).
? Where does the .phd 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 .phd 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.
all TLDs rankedfastest growingfastest decliningbulk datasets