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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.22.140.0/24 | 256 | ARIN |  US | 28th Jul 2026 |
| 198.22.141.0/24 | 256 | ARIN | US | 10th Aug 2026 |
| 198.22.142.0/24 | 256 | ARIN | US | 27th Jul 2026 |
| 198.22.143.0/24 | 256 | ARIN | US | 28th Aug 2026 |
| 198.22.146.0/24 | 256 | ARIN | US | 23rd Dec 1992 |
| 198.22.149.0/24 | 256 | ARIN | US | 29th Dec 1992 |
| 198.22.150.0/24 | 256 | ARIN | US | 29th Dec 1992 |
| 198.22.154.0/24 | 256 | ARIN | US | 29th Dec 1992 |
| 198.22.155.0/24 | 256 | ARIN | US | 29th Dec 1992 |
| 198.22.158.0/24 | 256 | ARIN | US | 30th Dec 1992 |
| 198.22.159.0/24 | 256 | ARIN | US | 30th Dec 1992 |
| 198.22.16.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.161.0/24 | 256 | ARIN | US | 30th Dec 1992 |
| 198.22.164.0/24 | 256 | ARIN | US | 30th Dec 1992 |
| 198.22.168.0/24 | 256 | ARIN | US | 30th Dec 1992 |
| 198.22.169.0/24 | 256 | ARIN | US | 31st Dec 1992 |
| 198.22.171.0/24 | 256 | ARIN | US | 31st Dec 1992 |
| 198.22.172.0/24 | 256 | ARIN | US | 4th Jan 1993 |
| 198.22.173.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.174.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.175.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.177.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.179.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.18.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.181.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.182.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.183.0/24 | 256 | ARIN | US | 5th Jan 1993 |
| 198.22.185.0/24 | 256 | ARIN | US | 6th Jan 1993 |
| 198.22.186.0/24 | 256 | ARIN | US | 6th Jan 1993 |
| 198.22.187.0/24 | 256 | ARIN | US | 6th Jan 1993 |
| 198.22.188.0/24 | 256 | ARIN |  CA | 7th Jan 1993 |
| 198.22.189.0/24 | 256 | ARIN | US | 7th Jan 1993 |
| 198.22.190.0/24 | 256 | ARIN | US | 7th Jan 1993 |
| 198.22.191.0/24 | 256 | ARIN | US | 11th Jan 1993 |
| 198.22.192.0/24 | 256 | ARIN | US | 11th Jan 1993 |
| 198.22.194.0/24 | 256 | ARIN | US | 11th Jan 1993 |
| 198.22.196.0/24 | 256 | ARIN | US | 11th Jan 1993 |
| 198.22.198.0/24 | 256 | ARIN | US | 11th Jan 1993 |
| 198.22.199.0/24 | 256 | ARIN | US | 11th Jan 1993 |
| 198.22.2.0/23 | 512 | ARIN | US | 20th Jun 2013 |
| 198.22.20.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.200.0/24 | 256 | ARIN | US | 13th Jan 1993 |
| 198.22.202.0/23 | 512 | ARIN | US | 20th Aug 2026 |
| 198.22.207.0/24 | 256 | ARIN | US | 13th Jan 1993 |
| 198.22.217.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.218.0/23 | 512 | ARIN | US | 15th Jan 1993 |
| 198.22.22.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.220.0/23 | 512 | ARIN | US | 15th Jan 1993 |
| 198.22.222.0/24 | 256 | ARIN | US | 15th Jan 1993 |
| 198.22.223.0/24 | 256 | ARIN | US | 15th Jan 1993 |