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~/dnsniffer/tlds/bio·rank #174

▸ How many .bio domains are registered?

77,686

active .bio domains as of .

# rank #174 of all TLDs ▼ 5 in 30d# all records held: 134,736# snapshots: 60
search .bio domains download the .bio dataset
~/tlds/bio/history·active domains
77,686
active .bio domains on 2026-10-15 · ▲ +42,325 (+119.69%) since 2025-06-30
29.8K44.2K58.6K72.9K87.3K2025-06-30: 35,361 active2025-07-31: 41,638 active2025-08-31: 41,797 active2025-09-30: 41,814 active2025-10-31: 41,814 active2025-11-30: 41,814 active2025-12-31: 45,662 active2026-01-31: 47,441 active2026-02-28: 47,441 active2026-03-31: 47,441 active2026-04-30: 61,284 active2026-05-31: 70,224 active2026-06-30: 76,437 active2026-07-31: 81,757 active2026-08-31: 81,753 active2026-09-01: 81,551 active2026-09-02: 80,782 active2026-09-03: 77,746 active2026-09-04: 77,499 active2026-09-05: 77,305 active2026-09-06: 77,008 active2026-09-07: 76,836 active2026-09-08: 76,833 active2026-09-09: 76,799 active2026-09-10: 76,831 active2026-09-11: 76,965 active2026-09-12: 76,987 active2026-09-13: 76,965 active2026-09-14: 76,971 active2026-09-15: 76,998 active2026-09-16: 76,995 active2026-09-17: 77,037 active2026-09-18: 77,043 active2026-09-19: 77,102 active2026-09-20: 77,115 active2026-09-21: 77,088 active2026-09-22: 77,096 active2026-09-23: 77,088 active2026-09-24: 77,272 active2026-09-25: 77,296 active2026-09-26: 77,336 active2026-09-27: 77,330 active2026-09-28: 77,380 active2026-09-29: 77,417 active2026-09-30: 77,380 active2026-10-01: 77,398 active2026-10-02: 77,441 active2026-10-03: 77,465 active2026-10-04: 77,463 active2026-10-05: 77,461 active2026-10-06: 77,527 active2026-10-07: 77,546 active2026-10-08: 77,628 active2026-10-09: 77,652 active2026-10-10: 77,639 active2026-10-11: 77,681 active2026-10-12: 77,664 active2026-10-13: 77,588 active2026-10-14: 77,616 active2026-10-15: 77,686 active2025-06-302026-10-15

# y-axis starts at 29.8K, 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
▲ +0.89%
+688 domains
90 days
▲ +1.63%
+1,249 domains
1 year
▲ +85.79%
+35,872 domains
# faq
? How many .bio domains are registered?
There are 77,686 active .bio domains as of October 15, 2026, according to DNSniffer’s daily count of zone-file and certificate-transparency records.
? Is .bio growing or shrinking?
.bio has grown by 85.79% over the last year (+35,872 domains).
? Where does the .bio 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 .bio 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.
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