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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

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Countries with the most unannounced blocks, largest first.

Unannounced blocks in United States

26,955 blocks match, ordered by prefix.

Allocated but unannounced blocks, 20101 to 20150 of 26955
PrefixAddressesRegistryCountryAllocated
23.166.156.0/24256ARINUS27th Oct 2026
23.166.172.0/24256ARINUS27th Oct 2026
23.166.192.0/24256ARINUS10th Jan 2018
23.166.200.0/24256ARINUS29th Nov 2023
23.166.226.0/24256ARINUS27th Jul 2020
23.166.236.0/24256ARINUS30th Oct 2026
23.166.252.0/24256ARINUS30th Oct 2026
23.166.60.0/24256ARINUS23rd Oct 2026
23.166.64.0/24256ARINUS9th Jan 2018
23.166.8.0/24256ARINUS17th Nov 2023
23.167.100.0/24256ARINUS4th Nov 2026
23.167.104.0/24256ARINUS5th Dec 2023
23.167.108.0/24256ARINUS4th Nov 2026
23.167.116.0/24256ARINUS5th Nov 2026
23.167.132.0/24256ARINUS5th Nov 2026
23.167.140.0/24256ARINUS9th Nov 2026
23.167.164.0/24256ARINUS9th Nov 2026
23.167.201.0/24256ARINUS9th Feb 2026
23.167.208.0/24256ARINUS28th Oct 2020
23.167.216.0/24256ARINUS14th Dec 2023
23.167.228.0/24256ARINUS10th Nov 2026
23.167.236.0/24256ARINUS10th Nov 2026
23.167.240.0/24256ARINUS28th Oct 2020
23.167.248.0/24256ARINUS14th Dec 2023
23.167.36.0/24256ARINUS2nd Nov 2026
23.167.4.0/24256ARINUS2nd Nov 2026
23.167.40.0/24256ARINUS4th Dec 2023
23.167.56.0/24256ARINUS5th Dec 2023
23.167.76.0/24256ARINUS4th Nov 2026
23.167.96.0/24256ARINUS14th Jan 2019
23.168.168.0/24256ARINUS28th Dec 2023
23.169.152.0/24256ARINUS18th Jan 2024
23.169.40.0/24256ARINUS5th Jan 2024
23.169.48.0/24256ARINUS16th Nov 2020
23.169.57.0/24256ARINUS26th Dec 2024
23.170.104.0/24256ARINUS29th Jan 2024
23.170.136.0/24256ARINUS31st Jan 2024
23.170.176.0/24256ARINUS27th Jan 2026
23.170.192.0/24256ARINUS25th Jan 2018
23.170.24.0/24256ARINUS25th Jan 2024
23.171.136.0/24256ARINUS9th Feb 2024
23.172.80.0/24256ARINUS28th Jan 2021
23.172.96.0/24256ARINUS4th Feb 2019
23.173.176.0/24256ARINUS10th Feb 2021
23.173.200.0/24256ARINUS14th Mar 2024
23.173.232.0/24256ARINUS15th Mar 2024
23.174.160.0/24256ARINUS19th Feb 2019
23.174.161.0/24256ARINUS8th Oct 2021
23.174.168.0/24256ARINUS28th Mar 2024
23.174.176.0/24256ARINUS26th Feb 2021