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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

2,663 blocks match, ordered by prefix.

Allocated but unannounced blocks, 1151 to 1200 of 2663
PrefixAddressesRegistryCountryAllocated
2001:40d8::/324.3B × /64RIPE NCCGB3rd Aug 2004
2001:4140::/324.3B × /64RIPE NCCGB23rd Sept 2004
2001:41e8::/324.3B × /64RIPE NCCGB2nd Dec 2004
2001:4bd0::/324.3B × /64RIPE NCCGB4th Mar 2005
2001:4be8::/324.3B × /64RIPE NCCGB10th Mar 2005
2001:4cb0::/324.3B × /64RIPE NCCGB13th Jun 2005
2001:4d30::/324.3B × /64RIPE NCCGB22nd Aug 2005
2001:504:20::/46262k × /64ARINGB11th Mar 2011
2001:678:1018::/4865.5k × /64RIPE NCCGB31st Jul 2026
2001:678:1028::/4865.5k × /64RIPE NCCGB5th Feb 2025
2001:678:1054::/4865.5k × /64RIPE NCCGB5th Mar 2025
2001:678:107c::/4865.5k × /64RIPE NCCGB30th Jun 2026
2001:678:1178::/4865.5k × /64RIPE NCCGB10th Dec 2025
2001:678:11a8::/4865.5k × /64RIPE NCCGB16th Jan 2026
2001:678:11ac::/4865.5k × /64RIPE NCCGB16th Jan 2026
2001:678:11b8::/4865.5k × /64RIPE NCCGB24th Feb 2026
2001:678:12bc::/4865.5k × /64RIPE NCCGB30th Jun 2026
2001:678:12d0::/4865.5k × /64RIPE NCCGB31st Jul 2026
2001:678:144::/4865.5k × /64RIPE NCCGB25th Nov 2019
2001:678:1ac::/4865.5k × /64RIPE NCCGB16th Jul 2019
2001:678:2cc::/4865.5k × /64RIPE NCCGB23rd Apr 2021
2001:678:2dc::/4865.5k × /64RIPE NCCGB23rd Nov 2016
2001:678:460::/4865.5k × /64RIPE NCCGB15th May 2017
2001:678:484::/4865.5k × /64RIPE NCCGB31st May 2017
2001:678:488::/4865.5k × /64RIPE NCCGB2nd Jun 2017
2001:678:4c8::/4865.5k × /64RIPE NCCGB30th Jun 2026
2001:678:500::/4865.5k × /64RIPE NCCGB1st Aug 2017
2001:678:550::/4865.5k × /64RIPE NCCGB23rd Oct 2017
2001:678:6b8::/4865.5k × /64RIPE NCCGB14th May 2018
2001:678:714::/4865.5k × /64RIPE NCCGB16th Aug 2022
2001:678:7a0::/4865.5k × /64RIPE NCCGB12th Dec 2024
2001:678:7a8::/4865.5k × /64RIPE NCCGB11th Jul 2018
2001:678:7d0::/4865.5k × /64RIPE NCCGB2nd Aug 2018
2001:678:900::/4865.5k × /64RIPE NCCGB11th Jan 2019
2001:678:91c::/4865.5k × /64RIPE NCCGB30th Jan 2019
2001:678:950::/4865.5k × /64RIPE NCCGB11th Feb 2019
2001:678:aa8::/4865.5k × /64RIPE NCCGB18th Jun 2019
2001:678:b04::/4865.5k × /64RIPE NCCGB9th Sept 2019
2001:678:b2c::/4865.5k × /64RIPE NCCGB7th Oct 2019
2001:678:c18::/4865.5k × /64RIPE NCCGB6th Feb 2026
2001:678:d90::/4865.5k × /64RIPE NCCGB15th Jun 2020
2001:678:e10::/4865.5k × /64RIPE NCCGB16th May 2025
2001:678:e78::/4865.5k × /64RIPE NCCGB10th Feb 2025
2001:678:f04::/4865.5k × /64RIPE NCCGB30th Jun 2026
2001:678:fb8::/4865.5k × /64RIPE NCCGB29th Jul 2026
2001:67c:1020::/47131k × /64RIPE NCCGB5th Nov 2010
2001:67c:1048::/4865.5k × /64RIPE NCCGB7th Aug 2012
2001:67c:105c::/4865.5k × /64RIPE NCCGB9th Aug 2012
2001:67c:10c4::/4865.5k × /64RIPE NCCGB11th Sept 2012
2001:67c:12c4::/4865.5k × /64RIPE NCCGB12th May 2025