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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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, 2051 to 2100 of 2663
PrefixAddressesRegistryCountryAllocated
2a0c:12c0::/2934.4B × /64RIPE NCCGB21st Mar 2018
2a0c:1800::/2934.4B × /64RIPE NCCGB13th Aug 2025
2a0c:2300::/2934.4B × /64RIPE NCCGB8th Nov 2017
2a0c:2a80::/2934.4B × /64RIPE NCCGB22nd Dec 2017
2a0c:2d40::/2934.4B × /64RIPE NCCGB29th Mar 2018
2a0c:3280::/2934.4B × /64RIPE NCCGB27th Dec 2017
2a0c:3c40::/324.3B × /64RIPE NCCGB4th Apr 2018
2a0c:4980::/2934.4B × /64RIPE NCCGB2nd Jan 2018
2a0c:49c0::/2934.4B × /64RIPE NCCGB17th Sept 2025
2a0c:4b00::/2934.4B × /64RIPE NCCGB10th Nov 2017
2a0c:4ec0::/2934.4B × /64RIPE NCCGB10th Apr 2018
2a0c:5400::/2934.4B × /64RIPE NCCGB31st Aug 2020
2a0c:5680::/2934.4B × /64RIPE NCCGB3rd Jan 2018
2a0c:56c0::/2934.4B × /64RIPE NCCGB12th Apr 2018
2a0c:5c80::/2934.4B × /64RIPE NCCGB4th Jan 2018
2a0c:5f80::/2934.4B × /64RIPE NCCGB4th Jan 2018
2a0c:6140::/2934.4B × /64RIPE NCCGB16th Apr 2018
2a0c:6400::/324.3B × /64RIPE NCCGB4th Oct 2017
2a0c:6c0::/2934.4B × /64RIPE NCCGB16th Mar 2018
2a0c:6cc0::/2934.4B × /64RIPE NCCGB19th Apr 2018
2a0c:7200::/2934.4B × /64RIPE NCCGB26th Jun 2020
2a0c:740::/2934.4B × /64RIPE NCCGB16th Mar 2018
2a0c:7640::/2934.4B × /64RIPE NCCGB20th Apr 2018
2a0c:7c40::/2934.4B × /64RIPE NCCGB24th Apr 2018
2a0c:80::/2934.4B × /64RIPE NCCGB14th Dec 2017
2a0c:8300::/2934.4B × /64RIPE NCCGB14th Nov 2017
2a0c:8800::/2934.4B × /64RIPE NCCGB25th Sept 2017
2a0c:8c40::/2934.4B × /64RIPE NCCGB3rd Jul 2020
2a0c:9140::/2934.4B × /64RIPE NCCGB1st May 2018
2a0c:9ec0::/2934.4B × /64RIPE NCCGB7th May 2018
2a0c:a140::/2934.4B × /64RIPE NCCGB8th May 2018
2a0c:ab00::/2934.4B × /64RIPE NCCGB7th May 2020
2a0c:af40::/2934.4B × /64RIPE NCCGB14th May 2018
2a0c:b940::/2934.4B × /64RIPE NCCGB15th May 2018
2a0c:ba00::/2934.4B × /64RIPE NCCGB24th Oct 2017
2a0c:bbc0::/324.3B × /64RIPE NCCGB30th Apr 2026
2a0c:bc80::/2934.4B × /64RIPE NCCGB17th Jan 2018
2a0c:c640::/2934.4B × /64RIPE NCCGB14th Jul 2020
2a0c:cdc0::/2934.4B × /64RIPE NCCGB17th Jul 2020
2a0c:d580::/2934.4B × /64RIPE NCCGB20th Jul 2020
2a0c:f000::/324.3B × /64RIPE NCCGB21st Sept 2017
2a0c:f100::/2934.4B × /64RIPE NCCGB23rd Jul 2020
2a0c:f980::/2934.4B × /64RIPE NCCGB24th Jan 2018
2a0d:1200::/2934.4B × /64RIPE NCCGB27th Oct 2017
2a0d:16c0::/324.3B × /64RIPE NCCGB8th Aug 2018
2a0d:19c0::/2934.4B × /64RIPE NCCGB10th Aug 2018
2a0d:1b40::/324.3B × /64RIPE NCCGB10th Aug 2018
2a0d:1bc0::/2934.4B × /64RIPE NCCGB13th Aug 2018
2a0d:31c0::/2934.4B × /64RIPE NCCGB22nd Aug 2018
2a0d:3240::/2934.4B × /64RIPE NCCGB20th Aug 2026