webXtrend knows 1,251,058 .io domains as of 8 October 2026. That puts it at rank 40 of the 1,441 top-level domains in our data. It is the country-code TLD of British Indian Ocean Territory, operated by Internet Computer Bureau Limited and in the root zone since 1997. Over the past twelve months it grew by 25.0 % (+250,185 domains). 33,480 new .io domains appeared in the last 30 days. 66.1 % of them serve a website, against 64.6 % across all TLDs.
| Top-level domain | .io |
|---|---|
| Type | Country-code top-level domain (ccTLD) |
| Country or territory | British Indian Ocean Territory |
| Registry operator | Internet Computer Bureau Limited |
| In the root zone | Yes, delegated on 16 September 1997 |
| DNSSEC | Signed |
| Registry website | www.nic.io |
| Domains known to webXtrend | 1,251,058 (8 October 2026) |
| New domains, last 30 days | 33,480 |
| Change over 12 months | +25.0 % |
| Zones counted | 2 (the TLD and its second-level zones) |
.io domains known to webXtrend at the start of each month, from January 2023 to October 2026.
| Date | Known to webXtrend | Change |
|---|---|---|
| 1 January 2023 | 612,861 | |
| 1 January 2024 | 777,216 | +26.8 % |
| 1 January 2025 | 921,298 | +18.5 % |
| 1 January 2026 | 1,043,063 | +13.2 % |
| 8 October 2026 | 1,251,058 | +19.9 % |
The count follows what webXtrend knows, not the registry's own books. Figures before 2023 are left out because our coverage was still being built up then, and a step in the curve can come from a change in coverage rather than in the zone.
| Month | New domains | Known at month start |
|---|---|---|
| October 2026 (so far) | 4,909 | 1,250,503 |
| September 2026 | 35,098 | 1,226,680 |
| August 2026 | 44,411 | 1,196,524 |
| July 2026 | 28,418 | 1,180,667 |
| June 2026 | 39,933 | 1,150,254 |
| May 2026 | 22,004 | 1,143,508 |
| April 2026 | 17,732 | 1,138,623 |
| March 2026 | 18,772 | 1,132,454 |
| February 2026 | 59,209 | 1,085,382 |
| January 2026 | 59,225 | 1,043,063 |
| December 2025 | 32,915 | 1,020,041 |
| November 2025 | 22,145 | 1,009,111 |
| Date | Known to webXtrend | New domains |
|---|---|---|
| 8 October 2026 | 1,251,058 | 738 |
| 7 October 2026 | 1,251,170 | 423 |
| 6 October 2026 | 1,251,379 | 421 |
| 5 October 2026 | 1,251,559 | 471 |
| 4 October 2026 | 1,251,658 | 465 |
| 3 October 2026 | 1,251,661 | 267 |
| 2 October 2026 | 1,250,616 | 1,499 |
| 1 October 2026 | 1,250,503 | 625 |
| 30 September 2026 | 1,250,344 | 630 |
| 29 September 2026 | 1,250,257 | 549 |
| 28 September 2026 | 1,250,359 | 346 |
| 27 September 2026 | 1,249,963 | 885 |
| 26 September 2026 | 1,249,952 | 534 |
| 25 September 2026 | 1,249,555 | 962 |
Share of the .io domains known to webXtrend with each property, next to the share across all top-level domains.
| Property | .io | All TLDs |
|---|---|---|
| Serve a website | 66.1 % | 64.6 % |
| Have an MX record (receive mail) | 51.8 % | 53.7 % |
| Redirect to HTTPS | 32.9 % | 25.6 % |
| Have a valid TLS certificate | 30.2 % | 24.4 % |
| Redirect to another domain | 9.3 % | 11.1 % |
| Reachable over IPv6 | 21.1 % | 20.2 % |
| No IP address (no A or AAAA record) | 11.7 % | 7.6 % |
| DNS error (SERVFAIL) | 2.9 % | 5.2 % |
.io is counted together with 1 second-level zones that take registrations of their own. The largest:
| Zone | Known to webXtrend | New on 8 Oct |
|---|---|---|
| .io | 1,251,058 | 738 |
| .com.io | 0 | 0 |
The domain list export contains every .io domain webXtrend knows, 1,251,058 today, one name per line, together with all other TLDs. To keep only .io: zgrep '\.io$' domains.txt.gz > io.txt. New .io domains come every day with the daily new-domain file, and the API answers for any single domain: DNS history, redirects, reverse IP and the start page. The list is compiled by webXtrend from its own web crawl. Zone files for all TLDs
Counts are the domains webXtrend knows, from its own measurement of the public domain name space. They are not the registry's figures: where a registry does not publish its zone, our count can be lower than its own. Registry facts come from the IANA root zone database.