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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through RIPE NCC, largest first.
Unannounced blocks registered through RIPE NCC
25,273 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 191.217.192.0/18 | 16.4k | RIPE NCC |  US | 6th Mar 2025 |
| 191.219.128.0/19 | 8.2k | RIPE NCC |  SG | 13th Mar 2025 |
| 191.45.0.0/19 | 8.2k | RIPE NCC |  LT | 6th Mar 2025 |
| 191.45.32.0/20 | 4.1k | RIPE NCC |  AE | 13th Mar 2025 |
| 192.100.102.0/23 | 512 | RIPE NCC |  GB | 12th Apr 1991 |
| 192.100.132.0/23 | 512 | RIPE NCC | GB | 12th Apr 1991 |
| 192.100.136.0/22 | 1k | RIPE NCC | GB | 12th Apr 1991 |
| 192.100.140.0/24 | 256 | RIPE NCC | GB | 12th Apr 1991 |
| 192.100.144.0/24 | 256 | RIPE NCC | GB | 16th Apr 1991 |
| 192.100.154.0/24 | 256 | RIPE NCC | GB | 22nd Apr 1991 |
| 192.100.18.0/24 | 256 | RIPE NCC |  FR | 13th Mar 1991 |
| 192.100.23.0/24 | 256 | RIPE NCC |  AT | 18th Mar 1991 |
| 192.100.24.0/24 | 256 | RIPE NCC | AT | 18th Mar 1991 |
| 192.100.25.0/24 | 256 | RIPE NCC | AT | 18th Mar 1991 |
| 192.100.52.0/24 | 256 | RIPE NCC | GB | 22nd Mar 1991 |
| 192.100.61.0/24 | 256 | RIPE NCC | GB | 26th Mar 1991 |
| 192.100.63.0/24 | 256 | RIPE NCC |  NO | 28th Mar 1991 |
| 192.100.66.0/24 | 256 | RIPE NCC | FR | 1st Apr 1991 |
| 192.100.98.0/24 | 256 | RIPE NCC |  DE | 12th Apr 1991 |
| 192.100.99.0/24 | 256 | RIPE NCC | GB | 12th Apr 1991 |
| 192.101.11.0/24 | 256 | RIPE NCC | GB | 28th Mar 1991 |
| 192.101.114.0/24 | 256 | RIPE NCC |  NL | 27th Jun 1991 |
| 192.101.137.0/24 | 256 | RIPE NCC | GB | 27th Jun 1991 |
| 192.101.170.0/24 | 256 | RIPE NCC |  BE | 11th Jul 1991 |
| 192.101.179.0/24 | 256 | RIPE NCC | DE | 16th Jul 1991 |
| 192.101.180.0/24 | 256 | RIPE NCC | DE | 16th Jul 1991 |
| 192.101.192.0/24 | 256 | RIPE NCC |  FI | 19th Jul 1991 |
| 192.101.197.0/24 | 256 | RIPE NCC | DE | 19th Jul 1991 |
| 192.101.198.0/24 | 256 | RIPE NCC | DE | 19th Jul 1991 |
| 192.101.28.0/24 | 256 | RIPE NCC | DE | 25th Apr 1991 |
| 192.101.34.0/24 | 256 | RIPE NCC | GB | 18th Jun 1991 |
| 192.101.4.0/24 | 256 | RIPE NCC |  RU | 11th Mar 1991 |
| 192.101.8.0/24 | 256 | RIPE NCC |  ES | 11th Mar 1991 |
| 192.101.81.0/24 | 256 | RIPE NCC | NL | 21st Jun 1991 |
| 192.101.82.0/24 | 256 | RIPE NCC | NL | 21st Jun 1991 |
| 192.101.83.0/24 | 256 | RIPE NCC | NL | 21st Jun 1991 |
| 192.101.88.0/24 | 256 | RIPE NCC | NL | 21st Jun 1991 |
| 192.101.90.0/24 | 256 | RIPE NCC | NL | 21st Jun 1991 |
| 192.102.1.0/24 | 256 | RIPE NCC | AT | 8th Mar 1991 |
| 192.102.18.0/23 | 512 | RIPE NCC | FI | 8th Mar 1991 |
| 192.102.20.0/22 | 1k | RIPE NCC | FI | 8th Mar 1991 |
| 192.102.227.0/24 | 256 | RIPE NCC | GB | 11th Apr 1991 |
| 192.102.228.0/24 | 256 | RIPE NCC | GB | 11th Apr 1991 |
| 192.102.24.0/21 | 2k | RIPE NCC | FI | 8th Mar 1991 |
| 192.102.64.0/23 | 512 | RIPE NCC | FI | 8th Mar 1991 |
| 192.102.66.0/23 | 512 | RIPE NCC | FI | 8th Mar 1991 |
| 192.102.68.0/22 | 1k | RIPE NCC | FI | 8th Mar 1991 |
| 192.102.72.0/21 | 2k | RIPE NCC | FI | 8th Mar 1991 |
| 192.102.8.0/24 | 256 | RIPE NCC | GB | 8th Mar 1991 |
| 192.102.80.0/23 | 512 | RIPE NCC | FI | 8th Mar 1991 |