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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,608 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 31.14.35.0/24 | 256 | RIPE NCC |  RO | 18th Apr 2011 |
| 31.14.42.0/24 | 256 | RIPE NCC | RO | 18th Apr 2011 |
| 31.14.49.0/24 | 256 | RIPE NCC | RO | 18th Apr 2011 |
| 31.14.50.0/23 | 512 | RIPE NCC |  BE | 18th Apr 2011 |
| 31.14.64.0/24 | 256 | RIPE NCC |  TR | 18th Apr 2011 |
| 31.170.120.0/21 | 2k | RIPE NCC |  DE | 30th Mar 2011 |
| 31.171.208.0/24 | 256 | RIPE NCC |  GE | 21st Jan 2026 |
| 31.171.209.0/24 | 256 | RIPE NCC |  AM | 21st Jan 2026 |
| 31.176.0.0/17 | 32.8k | RIPE NCC | TR | 4th Mar 2011 |
| 31.177.96.0/21 | 2k | RIPE NCC |  NL | 14th Mar 2011 |
| 31.186.88.0/21 | 2k | RIPE NCC |  NO | 24th Mar 2011 |
| 31.187.66.0/24 | 256 | RIPE NCC | DE | 25th Mar 2011 |
| 31.187.69.0/24 | 256 | RIPE NCC | DE | 25th Mar 2011 |
| 31.187.78.0/24 | 256 | RIPE NCC | DE | 25th Mar 2011 |
| 31.193.108.0/22 | 1k | RIPE NCC | DE | 27th Apr 2011 |
| 31.193.112.0/21 | 2k | RIPE NCC |  IR | 27th Apr 2011 |
| 31.193.190.0/24 | 256 | RIPE NCC |  SA | 19th Oct 2022 |
| 31.193.224.0/21 | 2k | RIPE NCC |  ES | 28th Apr 2011 |
| 31.207.48.0/22 | 1k | RIPE NCC | NL | 2nd May 2011 |
| 31.210.138.0/23 | 512 | RIPE NCC |  RU | 4th May 2011 |
| 31.210.188.0/22 | 1k | RIPE NCC |  IL | 4th May 2011 |
| 31.210.58.0/23 | 512 | RIPE NCC | TR | 4th May 2011 |
| 31.211.176.0/21 | 2k | RIPE NCC | DE | 9th May 2011 |
| 31.214.132.0/23 | 512 | RIPE NCC | IR | 6th May 2011 |
| 31.214.149.0/24 | 256 | RIPE NCC | DE | 6th May 2011 |
| 31.214.155.0/24 | 256 | RIPE NCC | ES | 6th May 2011 |
| 31.214.200.0/23 | 512 | RIPE NCC | IR | 6th May 2011 |
| 31.220.12.0/23 | 512 | RIPE NCC | DE | 10th May 2011 |
| 31.220.128.0/21 | 2k | RIPE NCC | RO | 11th May 2011 |
| 31.220.147.0/24 | 256 | RIPE NCC | DE | 11th May 2011 |
| 31.220.216.0/21 | 2k | ARIN |  US | 4th Dec 2024 |
| 31.220.245.0/24 | 256 | ARIN | US | 4th Dec 2024 |
| 31.220.36.0/22 | 1k | RIPE NCC | DE | 10th May 2011 |
| 31.220.8.0/22 | 1k | RIPE NCC | DE | 10th May 2011 |
| 31.222.230.0/24 | 256 | RIPE NCC |  CA | 6th Oct 2021 |
| 31.222.231.0/24 | 256 | RIPE NCC | DE | 6th Oct 2021 |
| 31.222.238.0/24 | 256 | RIPE NCC |  MD | 7th Oct 2021 |
| 31.222.251.0/24 | 256 | RIPE NCC |  SC | 7th Oct 2021 |
| 31.222.254.0/24 | 256 | RIPE NCC | DE | 7th Oct 2021 |
| 31.222.40.0/21 | 2k | RIPE NCC |  AL | 13th May 2011 |
| 31.223.176.0/21 | 2k | RIPE NCC |  PS | 16th May 2011 |
| 31.24.160.0/21 | 2k | RIPE NCC | NL | 24th Feb 2011 |
| 31.24.254.0/24 | 256 | RIPE NCC | TR | 29th Jun 2022 |
| 31.24.84.0/24 | 256 | RIPE NCC | DE | 11th Jan 2022 |
| 31.25.232.0/23 | 512 | RIPE NCC | IR | 9th Mar 2011 |
| 31.25.80.0/21 | 2k | RIPE NCC |  IE | 3rd Mar 2011 |
| 31.28.66.0/24 | 256 | RIPE NCC |  GB | 23rd Feb 2011 |
| 31.28.74.0/24 | 256 | RIPE NCC | GB | 23rd Feb 2011 |
| 31.3.148.0/23 | 512 | RIPE NCC | DE | 3rd Aug 2011 |
| 31.31.32.0/21 | 2k | RIPE NCC | NL | 17th Mar 2011 |