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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 the most unannounced blocks, largest first.

Unannounced blocks in United States

26,936 blocks match, ordered by prefix.

Allocated but unannounced blocks, 15201 to 15250 of 26936
PrefixAddressesRegistryCountryAllocated
2001:505:142::/4865.5k × /64ARINUS3rd Jan 2025
2001:505:143::/4865.5k × /64ARINUS29th Apr 2025
2001:505:145::/4865.5k × /64ARINUS13th Oct 2025
2001:505:146::/4865.5k × /64ARINUS24th Nov 2025
2001:505:148::/4865.5k × /64ARINUS23rd Jan 2026
2001:505:149::/4865.5k × /64ARINUS17th Feb 2026
2001:505:151::/4865.5k × /64ARINUS27th Apr 2026
2001:505:152::/4865.5k × /64ARINUS8th Jun 2026
2001:505:153::/4865.5k × /64ARINUS16th Jul 2026
2001:505:154::/4865.5k × /64ARINUS28th Jul 2026
2001:506:1000::/36268M × /64ARINUS8th May 2009
2001:506:100::/4865.5k × /64ARINUS1st Dec 2010
2001:506:1::/4865.5k × /64ARINUS22nd Apr 2009
2001:506:2000::/36268M × /64ARINUS1st Jun 2009
2001:506:200::/4016.8M × /64ARINUS27th Dec 2017
2001:506:21::/4865.5k × /64ARINUS16th Jul 2020
2001:506:28::/4865.5k × /64ARINUS23rd Feb 2011
2001:506:2::/4865.5k × /64ARINUS1st Jul 2022
2001:506:300::/4016.8M × /64ARINUS4th Nov 2019
2001:506:30::/4865.5k × /64ARINUS30th Oct 2018
2001:506:38::/4865.5k × /64ARINUS13th Apr 2020
2001:506:4000::/35537M × /64ARINUS11th May 2012
2001:506:6000::/35537M × /64ARINUS22nd May 2013
2001:506:8::/4865.5k × /64ARINUS7th May 2008
2001:506:9::/4865.5k × /64ARINUS14th Oct 2020
2001:506::/4865.5k × /64ARINUS17th Jan 2007
2001:530::/324.3B × /64ARINUS31st Oct 2002
2001:570::/324.3B × /64ARINUS5th Feb 2003
2001:5d0::/324.3B × /64ARINUS26th Mar 2003
2001:5f0::/324.3B × /64ARINUS28th Apr 2003
2001:678:106c::/4865.5k × /64RIPE NCCUS10th Apr 2025
2001:678:1354::/4865.5k × /64RIPE NCCUS25th Sept 2026
2001:678:218::/4865.5k × /64RIPE NCCUS1st Sept 2025
2001:678:34c::/4865.5k × /64RIPE NCCUS22nd Dec 2016
2001:67c:114c::/4865.5k × /64RIPE NCCUS15th Feb 2023
2001:67c:25f8::/4865.5k × /64RIPE NCCUS12th Dec 2011
2001:67c:272c::/4865.5k × /64RIPE NCCUS15th Feb 2023
2001:67c:29bc::/4865.5k × /64RIPE NCCUS4th Mar 2020
2001:67c:b3c::/4865.5k × /64RIPE NCCUS21st Dec 2022
2001:67c:b88::/4865.5k × /64RIPE NCCUS6th Feb 2023
2001:67c:cc0::/4865.5k × /64RIPE NCCUS21st Jul 2023
2001:67c:cc4::/4865.5k × /64RIPE NCCUS21st Jul 2023
2001:67c:d58::/4865.5k × /64RIPE NCCUS29th Nov 2023
2001:67c:d80::/4865.5k × /64RIPE NCCUS10th Jan 2024
2001:7f8:fd::/4865.5k × /64RIPE NCCUS6th Jul 2020
2001:df0:27e::/47131k × /64APNICUS27th Jan 2012
2001:df0:290::/4865.5k × /64APNICUS27th Jan 2012
2001:df0:2e40::/4865.5k × /64APNICUS13th Dec 2021
2001:df0:6f40::/4865.5k × /64APNICUS11th Feb 2022
2001:df0:7840::/4865.5k × /64APNICUS22nd Feb 2022