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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
27,001 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.110.32.0/19 | 8.2k | ARIN |  US | 22nd May 1991 |
| 192.110.4.0/22 | 1k | ARIN | US | 22nd May 1991 |
| 192.110.8.0/21 | 2k | ARIN | US | 22nd May 1991 |
| 192.111.0.0/24 | 256 | ARIN | US | 18th Mar 2015 |
| 192.111.106.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.111.113.0/24 | 256 | ARIN | US | 12th Sept 1991 |
| 192.111.114.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.111.115.0/24 | 256 | ARIN | US | 8th Aug 1991 |
| 192.111.119.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.120.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.121.0/24 | 256 | ARIN | US | 6th Jan 1995 |
| 192.111.122.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.126.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.160.0/19 | 8.2k | ARIN | US | 9th Aug 1991 |
| 192.111.192.0/20 | 4.1k | ARIN | US | 9th Aug 1991 |
| 192.111.208.0/23 | 512 | ARIN | US | 9th Aug 1991 |
| 192.111.210.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.211.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.212.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.215.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.216.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.218.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.219.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.220.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.221.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.223.0/24 | 256 | ARIN | US | 21st Aug 1991 |
| 192.111.225.0/24 | 256 | ARIN | US | 21st Sept 1992 |
| 192.111.226.0/24 | 256 | ARIN | US | 21st Sept 1992 |
| 192.111.228.0/24 | 256 | ARIN | US | 23rd Aug 1991 |
| 192.111.254.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.111.28.0/23 | 512 | ARIN | US | 13th Jun 2019 |
| 192.111.30.0/24 | 256 | ARIN | US | 3rd Apr 2025 |
| 192.111.35.0/24 | 256 | ARIN | US | 4th Jun 1991 |
| 192.111.45.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.46.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.49.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.50.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.51.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.52.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.53.0/24 | 256 | ARIN | US | 7th Jun 1991 |
| 192.111.87.0/24 | 256 | ARIN | US | 11th Jun 1991 |
| 192.111.89.0/24 | 256 | ARIN | US | 11th Jun 1991 |
| 192.111.96.0/22 | 1k | ARIN | US | 11th Aug 2020 |
| 192.112.1.0/24 | 256 | ARIN | US | 21st Jun 1991 |
| 192.112.101.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.112.103.0/24 | 256 | ARIN | US | 7th Aug 1991 |
| 192.112.12.0/24 | 256 | ARIN | US | 21st Jun 1991 |
| 192.112.13.0/24 | 256 | ARIN | US | 21st Jun 1991 |
| 192.112.138.0/24 | 256 | ARIN | US | 5th Sept 1991 |
| 192.112.139.0/24 | 256 | ARIN | US | 5th Sept 1991 |