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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.180.211.0/24 | 256 | ARIN |  US | 11th Aug 1993 |
| 198.180.212.0/24 | 256 | ARIN | US | 25th Mar 2025 |
| 198.180.213.0/24 | 256 | ARIN | US | 11th Aug 1993 |
| 198.180.214.0/24 | 256 | ARIN | US | 11th Aug 1993 |
| 198.180.215.0/24 | 256 | ARIN | US | 11th Aug 1993 |
| 198.180.216.0/24 | 256 | ARIN | US | 11th Aug 1993 |
| 198.180.217.0/24 | 256 | ARIN | US | 11th Aug 1993 |
| 198.180.220.0/22 | 1k | ARIN | US | 11th Aug 1993 |
| 198.180.224.0/24 | 256 | ARIN | US | 12th Aug 1993 |
| 198.180.226.0/24 | 256 | ARIN | US | 12th Aug 1993 |
| 198.180.227.0/24 | 256 | ARIN | US | 13th Aug 1993 |
| 198.180.228.0/24 | 256 | ARIN | US | 13th Aug 1993 |
| 198.180.230.0/24 | 256 | ARIN | US | 18th Nov 2025 |
| 198.180.231.0/24 | 256 | ARIN | US | 13th Aug 1993 |
| 198.180.232.0/24 | 256 | ARIN | US | 13th Aug 1993 |
| 198.180.233.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.180.234.0/23 | 512 | ARIN | US | 16th Aug 1993 |
| 198.180.236.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.180.237.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.180.238.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.180.239.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.180.242.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.180.243.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.180.244.0/22 | 1k | ARIN | US | 17th Aug 1993 |
| 198.180.248.0/23 | 512 | ARIN | US | 17th Aug 1993 |
| 198.180.252.0/24 | 256 | ARIN | US | 17th Aug 1993 |
| 198.180.64.0/18 | 16.4k | ARIN | US | 30th Jul 1993 |
| 198.180.8.0/21 | 2k | ARIN | US | 25th May 1993 |
| 198.181.0.0/22 | 1k | ARIN | US | 3rd Jun 1993 |
| 198.181.133.0/24 | 256 | ARIN | US | 19th Nov 1993 |
| 198.181.134.0/23 | 512 | ARIN | US | 19th Nov 1993 |
| 198.181.136.0/23 | 512 | ARIN | US | 19th Nov 1993 |
| 198.181.138.0/24 | 256 | ARIN | US | 19th Nov 1993 |
| 198.181.139.0/24 | 256 | ARIN | US | 23rd Nov 1993 |
| 198.181.140.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.142.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.143.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.144.0/22 | 1k | ARIN | US | 24th Nov 1993 |
| 198.181.148.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.149.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.150.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.151.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.152.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.153.0/24 | 256 | ARIN | US | 29th May 2026 |
| 198.181.154.0/24 | 256 | ARIN | US | 23rd Mar 2026 |
| 198.181.155.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.156.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.157.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.158.0/24 | 256 | ARIN | US | 24th Nov 1993 |
| 198.181.159.0/24 | 256 | ARIN | US | 7th Feb 2013 |