.icu domain statistics
.icu has 551,522 registered domains as of Oct 7, 2026, ranking #24 by size. Since its first check on Feb 24, 2026 it has grown by 13.3% (+64,825 domains). At its latest check it changed by −13,163 domains over 56 days, about −0.3% a week.
About the .icu extension
.icu has been in the internet's root zone since May 2, 2015, about 11.4 years, and is operated by ShortDot SA. Its ICANN registry agreement was signed on Jan 8, 2015, 114 days before launch.
Registry details from ICANN's gTLD list.
Other extensions run by ShortDot SA
ShortDot SA operates 5 of the TLDs RootFetch tracks, holding 3,839,656 domains in total. .icu is #4 of them by size, with 14.4% of the group's domains.
How .icu compares
By size, .icu sits ahead of 98% of tracked TLDs. Since Feb 24 it has changed +13.3%, against a median of +3.5% for large TLDs tracked as long, which puts it ahead of 73% of them. Its latest weekly rate, −0.3%, is faster than 6% of large TLDs right now. Next to its 10 nearest-sized neighbours, .icu out-grew 3; the fastest of that group was .digital at +64.3%.
Biggest moves
Of 10 changes between checks, 4 were gains, 6 were losses and 0 showed no change. The biggest gain was +63,698 domains (+12.7%) between Jul 1, 2026 and Aug 12, 2026. The biggest drop was −17,895 (−3.7%) between Mar 11, 2026 and Jun 3, 2026.
.icu growth trend
Its 551,522 names are 0.62% of the 89M domains across every tracked extension. Over the 225 days from Feb 24 to Oct 7 it averaged +0.39% a week, or +288 domains a day. Its strongest month on record was August 2026 (+63,698); its weakest was June 2026 (−17,895). If the latest rate held for 30 days, .icu would reach about 544,597 domains (a straight-line projection, not a forecast).
.icu domains by month
| Month | Domains | Change |
|---|---|---|
| October 2026 | 551,522 | −13,163 |
| August 2026 | 564,685 | +63,698 |
| July 2026 | 500,987 | +36,064 |
| June 2026 | 464,923 | −17,895 |
| March 2026 | 482,818 | −572 |
| February 2026 | 483,390 | – |
Every check
| Date | Domains | Change | Growth | Window | Severity |
|---|---|---|---|---|---|
| Oct 7, 2026 | 551,522 | −13,163 | −2.3% | 56 days | |
| Aug 12, 2026 | 564,685 | +63,698 | +12.7% | 42 days | |
| Jul 1, 2026 | 500,987 | +36,064 | +7.8% | 28 days | |
| Jun 3, 2026 | 464,923 | −17,895 | −3.7% | 84 days | |
| Mar 11, 2026 | 482,818 | −737 | −0.2% | 8 days | |
| Mar 3, 2026 | 483,555 | +47 | +0.0% | 1 day | |
| Mar 2, 2026 | 483,508 | +300 | +0.1% | 1 day | |
| Mar 1, 2026 | 483,208 | −182 | −0.0% | 3 days | |
| Feb 26, 2026 | 483,390 | −2,122 | −0.4% | 1 day | |
| Feb 25, 2026 | 485,512 | −1,185 | −0.2% | 1 day | |
| Feb 24, 2026 | 486,697 | – | – | first check |
Questions about .icu
How many .icu domains are there?
The .icu zone listed 551,522 domains when it was last checked on Oct 7, 2026.
Can anyone register a .icu domain?
Generally yes: .icu has no brand-only clause in its ICANN agreement, so registrars sell it to the public. ShortDot SA can still apply eligibility rules.
Who runs the .icu domain extension?
.icu is run by ShortDot SA.
When was .icu created?
May 2, 2015, when it entered the root zone.
Is .icu growing?
.icu went from 486,697 domains on Feb 24, 2026 to 551,522 on Oct 7, 2026, a change of +13.3%. Its latest rate is about −0.3% a week.
How big is the .icu domain extension compared to others?
By registered domains, .icu comes in at #24. Its nearest neighbours are .live, .space, .cfd.