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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,195 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.65.139.0/24 | 256 | RIPE NCC |  DE | 16th Nov 1989 |
| 192.65.140.0/24 | 256 | ARIN |  US | 16th Nov 1989 |
| 192.65.142.0/24 | 256 | ARIN | US | 17th Nov 1989 |
| 192.65.144.0/24 | 256 | RIPE NCC |  GB | 20th Nov 1989 |
| 192.65.145.0/24 | 256 | RIPE NCC | GB | 20th Nov 1989 |
| 192.65.146.0/24 | 256 | RIPE NCC | GB | 20th Nov 1989 |
| 192.65.149.0/24 | 256 | ARIN | US | 20th Nov 1989 |
| 192.65.150.0/24 | 256 | ARIN | US | 20th Nov 1989 |
| 192.65.151.0/24 | 256 | ARIN | US | 20th Nov 1989 |
| 192.65.152.0/24 | 256 | LACNIC |  VE | 20th Nov 1989 |
| 192.65.153.0/24 | 256 | RIPE NCC | GB | 21st Nov 1989 |
| 192.65.16.0/24 | 256 | RIPE NCC | GB | 1st Nov 1989 |
| 192.65.168.0/23 | 512 | ARIN | US | 21st Nov 2014 |
| 192.65.171.0/24 | 256 | ARIN | US | 27th Nov 1989 |
| 192.65.172.0/24 | 256 | ARIN | US | 21st Dec 2022 |
| 192.65.173.0/24 | 256 | ARIN | US | 27th Nov 1989 |
| 192.65.174.0/24 | 256 | ARIN | US | 27th Nov 1989 |
| 192.65.175.0/24 | 256 | ARIN | US | 28th Nov 1989 |
| 192.65.176.0/24 | 256 | ARIN |  PR | 28th Nov 1989 |
| 192.65.177.0/24 | 256 | ARIN | US | 28th Nov 1989 |
| 192.65.179.0/24 | 256 | ARIN | US | 29th Nov 1989 |
| 192.65.18.0/24 | 256 | ARIN | US | 19th Sept 2000 |
| 192.65.180.0/24 | 256 | ARIN | US | 29th Nov 1989 |
| 192.65.181.0/24 | 256 | ARIN | US | 10th Oct 2014 |
| 192.65.19.0/24 | 256 | ARIN | US | 22nd Apr 2026 |
| 192.65.198.0/24 | 256 | ARIN | US | 30th Nov 1989 |
| 192.65.199.0/24 | 256 | ARIN | US | 30th Nov 1989 |
| 192.65.200.0/24 | 256 | ARIN | US | 30th Nov 1989 |
| 192.65.201.0/24 | 256 | ARIN | US | 30th Nov 1989 |
| 192.65.202.0/24 | 256 | ARIN | US | 10th Apr 1997 |
| 192.65.204.0/22 | 1k | ARIN | US | 6th Dec 1989 |
| 192.65.208.0/23 | 512 | ARIN | US | 6th Dec 1989 |
| 192.65.210.0/24 | 256 | ARIN | US | 6th Dec 1989 |
| 192.65.211.0/24 | 256 | ARIN | US | 6th Dec 1989 |
| 192.65.212.0/24 | 256 | ARIN | US | 21st Jan 1990 |
| 192.65.216.0/24 | 256 | ARIN | US | 14th Apr 1997 |
| 192.65.218.0/24 | 256 | ARIN | US | 12th Dec 1989 |
| 192.65.220.0/24 | 256 | RIPE NCC | GB | 1st Apr 1992 |
| 192.65.24.0/22 | 1k | ARIN | US | 1st Nov 1989 |
| 192.65.245.0/24 | 256 | ARIN | US | 12th Dec 1989 |
| 192.65.247.0/24 | 256 | ARIN | US | 16th Oct 2014 |
| 192.65.250.0/24 | 256 | APNIC |  AU | 17th Feb 2011 |
| 192.65.253.0/24 | 256 | ARIN | US | 13th Dec 1989 |
| 192.65.254.0/24 | 256 | ARIN | US | 13th Dec 1989 |
| 192.65.30.0/23 | 512 | ARIN | US | 1st Nov 1989 |
| 192.65.32.0/22 | 1k | ARIN | US | 1st Nov 1989 |
| 192.65.38.0/24 | 256 | ARIN | US | 27th Feb 2026 |
| 192.65.48.0/23 | 512 | ARIN | US | 1st Nov 1989 |
| 192.65.50.0/24 | 256 | ARIN | US | 14th Oct 2014 |
| 192.65.51.0/24 | 256 | RIPE NCC |  NL | 3rd Nov 1989 |