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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.212.233.0/24 | 256 | ARIN |  US | 17th Jun 1994 |
| 198.212.234.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.235.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.236.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.240.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.241.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.242.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.243.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.244.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.245.0/24 | 256 | ARIN | US | 17th Jun 1994 |
| 198.212.246.0/24 | 256 | ARIN | US | 20th Jun 1994 |
| 198.212.248.0/23 | 512 | ARIN | US | 21st Jun 1994 |
| 198.212.250.0/24 | 256 | ARIN | US | 21st Jun 1994 |
| 198.212.252.0/22 | 1k | ARIN | US | 18th May 1994 |
| 198.212.28.0/22 | 1k | ARIN | US | 19th Sept 2012 |
| 198.212.37.0/24 | 256 | ARIN | US | 25th Jan 2024 |
| 198.212.4.0/23 | 512 | ARIN | US | 2nd Jul 1993 |
| 198.212.41.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.212.43.0/24 | 256 | ARIN | US | 22nd Jul 1993 |
| 198.212.46.0/23 | 512 | ARIN | US | 22nd Jul 1993 |
| 198.212.49.0/24 | 256 | ARIN |  CA | 14th Mar 2025 |
| 198.212.6.0/24 | 256 | ARIN | US | 2nd Jul 1993 |
| 198.217.0.0/22 | 1k | ARIN | US | 7th Jul 1993 |
| 198.217.249.0/24 | 256 | APNIC |  IN | 23rd Mar 1994 |
| 198.217.254.0/23 | 512 | ARIN | US | 23rd May 1994 |
| 198.217.4.0/24 | 256 | ARIN | US | 7th Jul 1993 |
| 198.217.5.0/24 | 256 | ARIN | US | 7th Nov 2012 |
| 198.22.0.0/24 | 256 | ARIN | US | 3rd Jul 2013 |
| 198.22.1.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.10.0/24 | 256 | ARIN | US | 5th Jul 2013 |
| 198.22.101.0/24 | 256 | ARIN | US | 15th Dec 1992 |
| 198.22.108.0/24 | 256 | ARIN | US | 15th Dec 1992 |
| 198.22.109.0/24 | 256 | ARIN | US | 15th Dec 1992 |
| 198.22.11.0/24 | 256 | ARIN | US | 1st Dec 1992 |
| 198.22.110.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.111.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.112.0/23 | 512 | ARIN | US | 18th Dec 1992 |
| 198.22.114.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.115.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.116.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.117.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.119.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.120.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.121.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.124.0/24 | 256 | ARIN | US | 18th Dec 1992 |
| 198.22.128.0/24 | 256 | ARIN | US | 26th May 2022 |
| 198.22.132.0/24 | 256 | ARIN | US | 22nd Dec 1992 |
| 198.22.133.0/24 | 256 | ARIN | US | 22nd Dec 1992 |
| 198.22.134.0/24 | 256 | ARIN | US | 22nd Dec 1992 |
| 198.22.139.0/24 | 256 | ARIN | US | 22nd Dec 1992 |