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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks in United States
116 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.134.136.0/22 | 1k | APNIC |  US | 14th Feb 2019 |
| 103.141.32.0/24 | 256 | APNIC | US | 15th Jul 2019 |
| 103.142.204.0/23 | 512 | APNIC | US | 4th Sept 2019 |
| 103.143.30.0/24 | 256 | APNIC | US | 13th Sept 2019 |
| 103.148.236.0/23 | 512 | APNIC | US | 26th Feb 2020 |
| 103.15.125.0/24 | 256 | APNIC | US | 28th Aug 2012 |
| 103.15.158.0/24 | 256 | APNIC | US | 28th Aug 2012 |
| 103.152.126.0/23 | 512 | APNIC | US | 23rd Jun 2020 |
| 103.160.218.0/23 | 512 | APNIC | US | 24th Dec 2020 |
| 103.165.242.0/24 | 256 | APNIC | US | 9th Apr 2021 |
| 103.179.91.0/24 | 256 | APNIC | US | 11th Jan 2022 |
| 103.180.188.0/24 | 256 | APNIC | US | 27th Jan 2022 |
| 103.202.219.0/24 | 256 | APNIC | US | 26th Nov 2015 |
| 103.219.77.0/24 | 256 | APNIC | US | 17th May 2016 |
| 103.23.112.0/22 | 1k | APNIC | US | 22nd Nov 2011 |
| 103.254.198.0/23 | 512 | APNIC | US | 17th Aug 2016 |
| 103.27.44.0/22 | 1k | APNIC | US | 1st Jul 2013 |
| 103.49.32.0/22 | 1k | APNIC | US | 30th Jan 2015 |
| 103.71.26.0/24 | 256 | APNIC | US | 5th Aug 2016 |
| 121.101.144.0/20 | 4.1k | APNIC | US | 16th Nov 2007 |
| 125.253.144.0/20 | 4.1k | APNIC | US | 5th Dec 2005 |
| 126.231.0.0/16 | 65.5k | APNIC | US | 8th Feb 2005 |
| 126.242.0.0/15 | 131k | APNIC | US | 8th Feb 2005 |
| 134.242.232.0/22 | 1k | APNIC | US | 15th Aug 1989 |
| 134.242.236.0/23 | 512 | APNIC | US | 15th Aug 1989 |
| 134.242.238.0/24 | 256 | APNIC | US | 15th Aug 1989 |
| 134.242.240.0/20 | 4.1k | APNIC | US | 15th Aug 1989 |
| 143.246.44.0/22 | 1k | APNIC | US | 26th Oct 1990 |
| 144.79.48.0/23 | 512 | APNIC | US | 1st Dec 2025 |
| 146.196.100.0/22 | 1k | APNIC | US | 22nd Mar 2016 |
| 160.22.88.0/23 | 512 | APNIC | US | 6th Jun 2024 |
| 162.249.119.0/24 | 256 | APNIC | US | 3rd Dec 2013 |
| 162.4.104.0/23 | 512 | APNIC | US | 11th May 2026 |
| 163.61.246.0/24 | 256 | APNIC | US | 27th Feb 2025 |
| 165.99.124.0/23 | 512 | APNIC | US | 26th May 2025 |
| 192.138.118.0/23 | 512 | APNIC | US | 21st Jan 2011 |
| 192.138.120.0/22 | 1k | APNIC | US | 11th Feb 2011 |
| 192.138.124.0/23 | 512 | APNIC | US | 11th Feb 2011 |
| 192.188.170.0/24 | 256 | APNIC | US | 20th Jul 1992 |
| 198.51.196.0/24 | 256 | APNIC | US | 11th Feb 2011 |
| 2001:df0:27e::/47 | 131k × /64 | APNIC | US | 27th Jan 2012 |
| 2001:df0:290::/48 | 65.5k × /64 | APNIC | US | 27th Jan 2012 |
| 2001:df0:2e40::/48 | 65.5k × /64 | APNIC | US | 13th Dec 2021 |
| 2001:df0:6f40::/48 | 65.5k × /64 | APNIC | US | 11th Feb 2022 |
| 2001:df0:7840::/48 | 65.5k × /64 | APNIC | US | 22nd Feb 2022 |
| 2001:df1:7f44::/46 | 262k × /64 | APNIC | US | 28th Jan 2026 |
| 2001:df1:7f48::/45 | 524k × /64 | APNIC | US | 28th Jan 2026 |
| 2001:df1:7f50::/44 | 1M × /64 | APNIC | US | 28th Jan 2026 |
| 2001:df1:7f60::/43 | 2.1M × /64 | APNIC | US | 28th Jan 2026 |
| 2001:df1:81c0::/48 | 65.5k × /64 | APNIC | US | 9th Nov 2022 |