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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.177.32.0/20 | 4.1k | ARIN |  US | 26th May 1993 |
| 198.177.48.0/22 | 1k | ARIN | US | 26th May 1993 |
| 198.177.96.0/20 | 4.1k | ARIN | US | 22nd Feb 1994 |
| 198.178.112.0/23 | 512 | ARIN | US | 25th Jun 1993 |
| 198.178.128.0/24 | 256 | ARIN | US | 14th Jul 1993 |
| 198.178.129.0/24 | 256 | ARIN | US | 14th Jul 1993 |
| 198.178.131.0/24 | 256 | ARIN | US | 15th Jul 1993 |
| 198.178.133.0/24 | 256 | ARIN | US | 15th Jul 1993 |
| 198.178.134.0/23 | 512 | ARIN | US | 15th Jul 1993 |
| 198.178.137.0/24 | 256 | ARIN | US | 15th Jul 1993 |
| 198.178.141.0/24 | 256 | ARIN | US | 15th Jul 1993 |
| 198.178.142.0/24 | 256 | ARIN | US | 15th Jul 1993 |
| 198.178.143.0/24 | 256 | ARIN | US | 15th Jul 1993 |
| 198.178.144.0/24 | 256 | ARIN | US | 15th Jul 1993 |
| 198.178.146.0/24 | 256 | ARIN | US | 16th Jul 1993 |
| 198.178.149.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.178.150.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.178.151.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.178.152.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.178.153.0/24 | 256 | ARIN | US | 19th Jul 1993 |
| 198.178.154.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.156.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.158.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.159.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.160.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.161.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.163.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.164.0/23 | 512 | ARIN | US | 21st Jul 1993 |
| 198.178.166.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.171.0/24 | 256 | ARIN | US | 21st Jul 1993 |
| 198.178.172.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.178.173.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.178.174.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.178.175.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.178.180.0/23 | 512 | ARIN | US | 22nd Jul 1993 |
| 198.178.186.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.189.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.192.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.195.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.196.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.197.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.198.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.199.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.200.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.202.0/24 | 256 | ARIN | US | 23rd Jul 1993 |
| 198.178.207.0/24 | 256 | ARIN | US | 26th Jul 1993 |
| 198.178.208.0/23 | 512 | ARIN | US | 26th Jul 1993 |
| 198.178.210.0/24 | 256 | ARIN | US | 26th Jul 1993 |
| 198.178.211.0/24 | 256 | ARIN | US | 26th Jul 1993 |
| 198.178.212.0/24 | 256 | ARIN | US | 26th Jul 1993 |