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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.207.32.0/19 | 8.2k | ARIN |  US | 1st Nov 1993 |
| 198.21.8.0/21 | 2k | ARIN | US | 25th Nov 1992 |
| 198.21.84.0/22 | 1k | ARIN | US | 31st Oct 2012 |
| 198.21.96.0/19 | 8.2k | ARIN | US | 3rd Dec 2012 |
| 198.210.12.0/23 | 512 | ARIN | US | 30th Jun 1993 |
| 198.210.128.0/17 | 32.8k | ARIN | US | 18th May 1994 |
| 198.210.4.0/22 | 1k | ARIN | US | 30th Jun 1993 |
| 198.210.8.0/22 | 1k | ARIN | US | 30th Jun 1993 |
| 198.212.0.0/22 | 1k | ARIN | US | 2nd Jul 1993 |
| 198.212.131.0/24 | 256 | ARIN | US | 31st May 1994 |
| 198.212.132.0/24 | 256 | ARIN | US | 31st May 1994 |
| 198.212.133.0/24 | 256 | ARIN | US | 31st May 1994 |
| 198.212.134.0/24 | 256 | ARIN | US | 31st May 1994 |
| 198.212.135.0/24 | 256 | ARIN | US | 1st Jun 1994 |
| 198.212.136.0/22 | 1k | ARIN | US | 1st Jun 1994 |
| 198.212.140.0/24 | 256 | ARIN | US | 1st Jun 1994 |
| 198.212.142.0/24 | 256 | ARIN | US | 1st Jun 1994 |
| 198.212.143.0/24 | 256 | ARIN | US | 1st Jun 1994 |
| 198.212.144.0/22 | 1k | ARIN | US | 1st Jun 1994 |
| 198.212.148.0/23 | 512 | ARIN | US | 1st Jun 1994 |
| 198.212.150.0/24 | 256 | ARIN | US | 1st Jun 1994 |
| 198.212.154.0/24 | 256 | ARIN | US | 2nd Jun 1994 |
| 198.212.155.0/24 | 256 | ARIN | US | 2nd Jun 1994 |
| 198.212.156.0/24 | 256 | ARIN | US | 2nd Jun 1994 |
| 198.212.158.0/24 | 256 | ARIN | US | 2nd Jun 1994 |
| 198.212.159.0/24 | 256 | ARIN | US | 2nd Jun 1994 |
| 198.212.160.0/23 | 512 | ARIN | US | 2nd Jun 1994 |
| 198.212.167.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.168.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.169.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.170.0/24 | 256 | ARIN | US | 7th Jun 1994 |
| 198.212.172.0/22 | 1k | ARIN | US | 8th Jun 1994 |
| 198.212.177.0/24 | 256 | ARIN | US | 8th Jun 1994 |
| 198.212.178.0/23 | 512 | ARIN | US | 8th Jun 1994 |
| 198.212.180.0/24 | 256 | ARIN | US | 8th Jun 1994 |
| 198.212.181.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.182.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.189.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.190.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.191.0/24 | 256 | ARIN | US | 9th Jun 1994 |
| 198.212.198.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.201.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.203.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.204.0/24 | 256 | ARIN | US | 13th Jun 1994 |
| 198.212.212.0/24 | 256 | ARIN | US | 14th Jun 1994 |
| 198.212.216.0/24 | 256 | ARIN | US | 15th Jun 1994 |
| 198.212.217.0/24 | 256 | ARIN | US | 15th Jun 1994 |
| 198.212.221.0/24 | 256 | ARIN | US | 16th Jun 1994 |
| 198.212.223.0/24 | 256 | ARIN | US | 16th Jun 1994 |
| 198.212.232.0/24 | 256 | ARIN | US | 17th Jun 1994 |