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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.231.128.0/17 | 32.8k | ARIN |  US | 12th Nov 1993 |
| 198.231.14.0/23 | 512 | ARIN | US | 27th Apr 2021 |
| 198.231.24.0/23 | 512 | ARIN | US | 31st Aug 1993 |
| 198.231.32.0/19 | 8.2k | ARIN | US | 8th Nov 1993 |
| 198.231.4.0/23 | 512 | ARIN | US | 14th Jul 1993 |
| 198.231.8.0/22 | 1k | ARIN | US | 22nd Jul 1993 |
| 198.232.130.0/23 | 512 | ARIN | US | 12th Nov 1993 |
| 198.232.132.0/24 | 256 | ARIN | US | 12th Nov 1993 |
| 198.232.134.0/24 | 256 | ARIN | US | 12th Nov 1993 |
| 198.232.135.0/24 | 256 | ARIN | US | 12th Nov 1993 |
| 198.232.136.0/24 | 256 | ARIN | US | 12th Nov 1993 |
| 198.232.137.0/24 | 256 | ARIN | US | 12th Mar 1996 |
| 198.232.138.0/24 | 256 | ARIN | US | 12th Mar 1996 |
| 198.232.140.0/24 | 256 | ARIN | US | 2nd Jul 2026 |
| 198.232.142.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.143.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.145.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.146.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.147.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.148.0/22 | 1k | ARIN | US | 15th Nov 1993 |
| 198.232.152.0/22 | 1k | ARIN | US | 15th Nov 1993 |
| 198.232.156.0/23 | 512 | ARIN | US | 15th Nov 1993 |
| 198.232.158.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.159.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.161.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.167.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.170.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.171.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.172.0/22 | 1k | ARIN | US | 15th Nov 1993 |
| 198.232.176.0/24 | 256 | ARIN | US | 15th Nov 1993 |
| 198.232.178.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.179.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.180.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.181.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.182.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.188.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.189.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.196.0/24 | 256 | ARIN | US | 16th Nov 1993 |
| 198.232.197.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.204.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.205.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.206.0/23 | 512 | ARIN | US | 17th Nov 1993 |
| 198.232.208.0/23 | 512 | ARIN | US | 17th Nov 1993 |
| 198.232.210.0/24 | 256 | ARIN | US | 17th Nov 1993 |
| 198.232.218.0/23 | 512 | ARIN | US | 10th Sept 2012 |
| 198.232.221.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.224.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.225.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.226.0/23 | 512 | ARIN | US | 18th Nov 1993 |
| 198.232.229.0/24 | 256 | ARIN | US | 18th Nov 1993 |