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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,392 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 204.79.190.0/24 | 256 | ARIN |  US | 14th Dec 1994 |
| 204.79.191.0/24 | 256 | ARIN |  SE | 14th Dec 1994 |
| 204.79.194.0/24 | 256 | ARIN |  GB | 15th Dec 1994 |
| 204.79.198.0/24 | 256 | ARIN | GB | 15th Dec 1994 |
| 204.79.199.0/24 | 256 | ARIN |  DE | 15th Dec 1994 |
| 204.79.200.0/24 | 256 | ARIN | DE | 15th Dec 1994 |
| 204.79.201.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.202.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.203.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.204.0/24 | 256 | ARIN |  BE | 19th Dec 1994 |
| 204.79.205.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.206.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.207.0/24 | 256 | ARIN | GB | 19th Dec 1994 |
| 204.79.208.0/23 | 512 | ARIN |  FR | 19th Dec 1994 |
| 204.79.210.0/24 | 256 | ARIN | FR | 19th Dec 1994 |
| 204.79.211.0/24 | 256 | ARIN | GB | 19th Dec 1994 |
| 204.79.212.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.213.0/24 | 256 | ARIN | FR | 19th Dec 1994 |
| 204.79.214.0/23 | 512 | ARIN | FR | 19th Dec 1994 |
| 204.79.218.0/24 | 256 | ARIN |  JP | 19th Dec 1994 |
| 204.79.219.0/24 | 256 | ARIN |  NO | 19th Dec 1994 |
| 204.79.220.0/22 | 1k | ARIN | US | 19th Dec 1994 |
| 204.79.224.0/23 | 512 | ARIN |  CA | 19th Dec 1994 |
| 204.79.228.0/24 | 256 | ARIN | FR | 19th Dec 1994 |
| 204.79.229.0/24 | 256 | ARIN |  CH | 19th Dec 1994 |
| 204.79.231.0/24 | 256 | ARIN | GB | 19th Dec 1994 |
| 204.79.232.0/23 | 512 | ARIN | NO | 19th Dec 1994 |
| 204.79.234.0/24 | 256 | ARIN | NO | 19th Dec 1994 |
| 204.79.235.0/24 | 256 | ARIN | DE | 19th Dec 1994 |
| 204.79.236.0/24 | 256 | ARIN | DE | 19th Dec 1994 |
| 204.79.237.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.238.0/23 | 512 | ARIN | US | 19th Dec 1994 |
| 204.79.240.0/24 | 256 | ARIN |  IT | 19th Dec 1994 |
| 204.79.241.0/24 | 256 | ARIN | DE | 19th Dec 1994 |
| 204.79.242.0/24 | 256 | ARIN | DE | 19th Dec 1994 |
| 204.79.243.0/24 | 256 | ARIN | US | 19th Dec 1994 |
| 204.79.244.0/23 | 512 | ARIN | CA | 19th Dec 1994 |
| 204.79.246.0/23 | 512 | ARIN |  NL | 21st Apr 1995 |
| 204.79.248.0/22 | 1k | ARIN | NL | 21st Apr 1995 |
| 204.79.253.0/24 | 256 | ARIN | NL | 19th Dec 1994 |
| 204.79.254.0/23 | 512 | ARIN | NL | 19th Dec 1994 |
| 204.8.200.0/22 | 1k | ARIN | US | 12th Aug 2004 |
| 204.8.206.0/24 | 256 | AFRINIC |  NG | 26th Apr 2017 |
| 204.8.208.0/21 | 2k | ARIN | US | 18th Aug 2004 |
| 204.8.237.0/24 | 256 | ARIN | CA | 27th Nov 2023 |
| 204.80.129.0/24 | 256 | ARIN | US | 12th Dec 1994 |
| 204.80.131.0/24 | 256 | ARIN | US | 15th Dec 1994 |
| 204.80.133.0/24 | 256 | ARIN | US | 15th Dec 1994 |
| 204.80.134.0/24 | 256 | ARIN | US | 10th Jan 1995 |
| 204.80.135.0/24 | 256 | ARIN | US | 10th Jan 1995 |