subnet.im

Allocated but unannounced space

Every block here was allocated or assigned by a regional internet registry, and none of them appeared in any routing table we collected at our last snapshot — neither as a route of their own, nor covered by a larger announcement, nor carved up into more specifics.

“Unannounced” does not mean “unused”

Plenty of allocated space is deliberately kept off the public internet: private interconnects, lab and lawful-intercept ranges, networks reachable only inside one operator, and space held in reserve. Some of it is announced somewhere our collectors cannot see, which is a limit of our vantage points rather than a fact about the block.

It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today. Nothing on this page means a block is unallocated, available, or free to announce.

Browse by registry

Browse by country

Countries with unannounced space registered through ARIN, largest first.

Unannounced blocks in United States

26,283 blocks match, ordered by prefix.

Allocated but unannounced blocks, 21801 to 21850 of 26283
PrefixAddressesRegistryCountryAllocated
2604:3100::/324.3B × /64ARINUS29th Mar 2011
2604:3140::/324.3B × /64ARINUS11th Apr 2017
2604:3180::/324.3B × /64ARINUS2nd Nov 2012
2604:31c0::/324.3B × /64ARINUS12th Apr 2017
2604:3240::/324.3B × /64ARINUS12th Apr 2017
2604:3300::/324.3B × /64ARINUS31st Mar 2011
2604:3340::/324.3B × /64ARINUS14th Apr 2017
2604:33c0::/324.3B × /64ARINUS17th Apr 2017
2604:3480::/324.3B × /64ARINUS8th Nov 2012
2604:34c0::/324.3B × /64ARINUS19th Apr 2017
2604:3580::/324.3B × /64ARINUS8th Nov 2012
2604:35c0::/324.3B × /64ARINUS2nd Jan 2026
2604:3600::/324.3B × /64ARINUS26th Oct 2010
2604:360::/324.3B × /64ARINUS12th Feb 2025
2604:3640::/324.3B × /64ARINUS20th Apr 2017
2604:3680::/324.3B × /64ARINUS9th Nov 2012
2604:3780::/324.3B × /64ARINUS14th Nov 2012
2604:37c0::/324.3B × /64ARINUS24th Apr 2017
2604:3800::/324.3B × /64ARINUS16th Apr 2010
2604:380::/324.3B × /64ARINUS8th Aug 2012
2604:3880::/324.3B × /64ARINUS3rd Dec 2012
2604:3980::/324.3B × /64ARINUS13th Aug 2026
2604:39c0::/324.3B × /64ARINUS27th Apr 2017
2604:3a40::/324.3B × /64ARINUS19th Aug 2026
2604:3ac0::/324.3B × /64ARINUS1st May 2017
2604:3bc0::/324.3B × /64ARINUS2nd May 2017
2604:3c00::/324.3B × /64ARINUS18th Jun 2010
2604:3c0::/324.3B × /64ARINUS27th Dec 2016
2604:3c40::/324.3B × /64ARINUS4th May 2017
2604:3e80::/324.3B × /64ARINUS10th Dec 2012
2604:3ec0::/324.3B × /64ARINUS19th Aug 2026
2604:3f80::/324.3B × /64ARINUS10th Dec 2012
2604:4040::/324.3B × /64ARINUS16th May 2017
2604:41c0::/324.3B × /64ARINUS23rd May 2017
2604:4340::/324.3B × /64ARINUS31st May 2017
2604:4380::/324.3B × /64ARINUS8th Jan 2026
2604:43c0::/324.3B × /64ARINUS1st Jun 2017
2604:4400::/324.3B × /64ARINUS18th Jun 2010
2604:4440::/324.3B × /64ARINUS2nd Jun 2017
2604:46c0::/324.3B × /64ARINUS12th Jan 2026
2604:4740::/324.3B × /64ARINUS7th Jun 2017
2604:47c0::/324.3B × /64ARINUS8th Jun 2017
2604:4800::/324.3B × /64ARINUS16th Apr 2010
2604:4900::/324.3B × /64ARINUS5th Apr 2011
2604:4980::/324.3B × /64ARINUS17th Dec 2012
2604:4ac0::/324.3B × /64ARINUS16th Jun 2017
2604:4b00::/324.3B × /64ARINUS6th Apr 2011
2604:4b80::/324.3B × /64ARINUS18th Dec 2012
2604:4c0::/324.3B × /64ARINUS29th Dec 2016
2604:4c80::/324.3B × /64ARINUS20th Dec 2012