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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

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Countries with unannounced space registered through ARIN, largest first.

Unannounced blocks in United States

26,277 blocks match, ordered by prefix.

Allocated but unannounced blocks, 24251 to 24300 of 26277
PrefixAddressesRegistryCountryAllocated
2620:3b:8000::/4865.5k × /64ARINUS11th May 2011
2620:3b::/4865.5k × /64ARINUS20th Jan 2011
2620:3b:c000::/441M × /64ARINUS9th Aug 2013
2620:3c:40c0::/4865.5k × /64ARINUS17th Mar 2016
2620:3c:8080::/4865.5k × /64ARINUS29th Jun 2012
2620:3c:c040::/4865.5k × /64ARINUS13th Apr 2016
2620:3d:4000::/4865.5k × /64ARINUS9th Aug 2013
2620:3d:6000::/4865.5k × /64ARINUS29th Nov 2017
2620:3d:8000::/4865.5k × /64ARINUS12th May 2011
2620:3d::/4865.5k × /64ARINUS21st Jan 2011
2620:3e:2000::/4865.5k × /64ARINUS22nd Dec 2017
2620:3e:6000::/4865.5k × /64ARINUS16th Jun 2026
2620:3e:8000::/4865.5k × /64ARINUS12th May 2011
2620:3e:c000::/4865.5k × /64ARINUS14th Aug 2013
2620:3e:e000::/4865.5k × /64ARINUS29th Dec 2017
2620:40:2000::/4865.5k × /64ARINUS23rd Jan 2018
2620:40:8000::/4865.5k × /64ARINUS13th May 2011
2620:40::/4865.5k × /64ARINUS27th Jan 2010
2620:40:c000::/4865.5k × /64ARINUS27th Aug 2013
2620:40:e000::/4865.5k × /64ARINUS30th Jan 2018
2620:41:2000::/4865.5k × /64ARINUS31st Jan 2018
2620:41:8000::/4865.5k × /64ARINUS13th May 2011
2620:41:a000::/4865.5k × /64ARINUS6th Feb 2018
2620:42:2000::/4865.5k × /64ARINUS7th Feb 2018
2620:42:4000::/4865.5k × /64ARINUS28th Aug 2013
2620:42:6000::/4865.5k × /64ARINUS20th Oct 2025
2620:42:8000::/4865.5k × /64ARINUS26th Jun 2026
2620:42::/4865.5k × /64ARINUS9th Jul 2010
2620:42:a000::/4865.5k × /64ARINUS12th Feb 2018
2620:43:2000::/4865.5k × /64ARINUS15th Feb 2018
2620:43:4000::/4865.5k × /64ARINUS3rd Sept 2013
2620:43:6000::/4865.5k × /64ARINUS21st Feb 2018
2620:43:8000::/4865.5k × /64ARINUS17th May 2011
2620:43::/4865.5k × /64ARINUS24th Jan 2011
2620:43:a000::/4865.5k × /64ARINUS22nd Feb 2018
2620:43:e000::/4865.5k × /64ARINUS22nd Feb 2018
2620:44:2000::/4865.5k × /64ARINUS22nd Feb 2018
2620:44:4000::/4865.5k × /64ARINUS9th Sept 2013
2620:44:8000::/4865.5k × /64ARINUS17th May 2011
2620:44:c000::/4865.5k × /64ARINUS2nd Jul 2026
2620:45:4000::/4865.5k × /64ARINUS12th Sept 2013
2620:45:8000::/4865.5k × /64ARINUS18th May 2011
2620:45:a000::/4865.5k × /64ARINUS20th Mar 2018
2620:45:c000::/4865.5k × /64ARINUS13th Sept 2013
2620:45:e000::/4865.5k × /64ARINUS29th Mar 2018
2620:46::/4865.5k × /64ARINUS13th Jul 2010
2620:46:c000::/441M × /64ARINUS16th Sept 2013
2620:47:4000::/4865.5k × /64ARINUS19th Sept 2013
2620:47:8000::/4865.5k × /64ARINUS24th May 2011
2620:47:a000::/4865.5k × /64ARINUS9th Apr 2018