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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

30,470 blocks match, ordered by prefix.

Allocated but unannounced blocks, 17001 to 17050 of 30470
PrefixAddressesRegistryCountryAllocated
2001:504:e::/4865.5k × /64ARINUS29th Jun 2006
2001:504:f::/4865.5k × /64ARINUS29th Jun 2006
2001:505:140::/4865.5k × /64ARINUS10th Sept 2024
2001:505:141::/4865.5k × /64ARINVC21st Oct 2024
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
2001:505:147::/4865.5k × /64ARINCA8th Dec 2025
2001:505:148::/4865.5k × /64ARINUS23rd Jan 2026
2001:505:149::/4865.5k × /64ARINUS17th Feb 2026
2001:505:150::/4865.5k × /64ARINLC20th 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
2001:506:3a::/4865.5k × /64ARINUS24th Dec 2025
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
2001:5d8::/324.3B × /64ARINUS4th Apr 2003
2001:5f0::/324.3B × /64ARINUS28th Apr 2003
201.19.0.0/1665.5kARINUS29th Jul 2026
201.29.0.0/1665.5kARINUS27th May 2026
201.32.128.0/198.2kARINUS13th Mar 2025
201.4.128.0/1732.8kARINUS29th Jul 2026
201.50.128.0/1732.8kARINUS29th Jul 2026
201.51.128.0/1732.8kARINUS29th Jul 2026
201.78.0.0/1732.8kARINUS29th Jul 2026
201.78.224.0/198.2kARINUS13th Mar 2025
201.8.0.0/198.2kARINUS13th Mar 2025
201.8.128.0/1732.8kARINUS29th Jul 2026
201.8.32.0/204.1kARINUS13th Mar 2025
201.89.128.0/198.2kARINUS13th Mar 2025