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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

27,014 blocks match, ordered by prefix.

Allocated but unannounced blocks, 19951 to 20000 of 27014
PrefixAddressesRegistryCountryAllocated
23.146.148.0/24256ARINUS1st Oct 2025
23.146.17.0/24256ARINUS20th Apr 2020
23.146.18.0/24256ARINUS20th Apr 2020
23.146.184.0/24256ARINUS25th Jan 2023
23.146.20.0/24256ARINUS24th Sept 2025
23.146.208.0/24256ARINUS12th Dec 2019
23.146.217.0/24256ARINUS11th Dec 2024
23.146.252.0/24256ARINUS7th Oct 2025
23.146.52.0/24256ARINUS26th Sept 2025
23.146.60.0/24256ARINUS29th Sept 2025
23.146.92.0/24256ARINUS30th Sept 2025
23.147.124.0/24256ARINUS15th Oct 2025
23.147.132.0/24256ARINUS16th Oct 2025
23.147.192.0/24256ARINUS23rd Oct 2017
23.147.20.0/24256ARINUS8th Oct 2025
23.147.32.0/24256ARINUS29th Aug 2018
23.148.0.0/24256ARINUS9th Dec 2015
23.148.100.0/24256ARINUS27th Oct 2025
23.148.148.0/24256ARINUS29th Oct 2025
23.148.156.0/24256ARINUS29th Oct 2025
23.148.168.0/24256ARINUS27th Feb 2023
23.148.172.0/24256ARINUS29th Oct 2025
23.148.40.0/24256ARINUS15th Feb 2023
23.149.132.0/24256ARINUS13th Nov 2025
23.149.164.0/24256ARINUS13th Nov 2025
23.149.188.0/24256ARINUS14th Nov 2025
23.149.200.0/24256ARINUS16th Mar 2023
23.149.220.0/24256ARINUS18th Nov 2025
23.149.252.0/24256ARINUS20th Nov 2025
23.149.56.0/24256ARINUS9th Mar 2023
23.149.84.0/24256ARINUS20th Feb 2026
23.150.112.0/24256ARINUS10th Feb 2020
23.150.168.0/24256ARINUS5th Apr 2023
23.150.180.0/24256ARINUS3rd Dec 2025
23.150.33.0/24256ARINUS19th Jul 2019
23.150.4.0/24256ARINUS21st Nov 2025
23.150.48.0/24256ARINUS10th Feb 2020
23.150.64.0/24256ARINUS2nd Nov 2017
23.150.72.0/24256ARINUS24th Mar 2023
23.150.92.0/24256ARINUS25th Nov 2025
23.151.120.0/24256ARINUS20th Apr 2023
23.151.172.0/24256ARINUS19th Dec 2025
23.151.180.0/24256ARINUS24th Dec 2025
23.151.228.0/24256ARINUS24th Dec 2025
23.151.233.0/24256ARINUS3rd Nov 2023
23.151.248.0/24256ARINUS26th Apr 2023
23.151.40.0/24256ARINUS13th Apr 2023
23.151.44.0/24256ARINUS17th Dec 2025
23.151.64.0/24256ARINUS3rd Nov 2017
23.152.148.0/24256ARINUS26th Feb 2026