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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.110.224.0/20 | 4.1k | ARIN |  US | 22nd May 1991 |
| 192.110.240.0/21 | 2k | ARIN | US | 22nd May 1991 |
| 192.110.248.0/23 | 512 | ARIN | US | 22nd May 1991 |
| 192.110.250.0/24 | 256 | ARIN | US | 22nd May 1991 |
| 192.110.252.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.110.253.0/24 | 256 | ARIN | US | 30th May 1991 |
| 192.110.254.0/24 | 256 | ARIN | US | 30th May 1991 |
| 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 |
| 192.111.101.0/24 | 256 | RIPE NCC |  PT | 11th Jun 1991 |
| 192.111.102.0/24 | 256 | APNIC |  NZ | 13th Jun 1991 |
| 192.111.103.0/24 | 256 | RIPE NCC |  CH | 7th Aug 1991 |
| 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 |
| 192.111.124.0/23 | 512 | RIPE NCC |  NO | 19th Aug 1991 |
| 192.111.126.0/24 | 256 | ARIN | US | 19th Aug 1991 |
| 192.111.127.0/24 | 256 | RIPE NCC |  DE | 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 |
| 192.111.252.0/24 | 256 | RIPE NCC |  AT | 27th Aug 1991 |
| 192.111.254.0/24 | 256 | ARIN | US | 27th Aug 1991 |
| 192.111.255.0/24 | 256 | ARIN |  CA | 1st Jul 2025 |
| 192.111.28.0/23 | 512 | ARIN | US | 13th Jun 2019 |
| 192.111.30.0/24 | 256 | ARIN | US | 3rd Apr 2025 |
| 192.111.32.0/24 | 256 | APNIC |  AU | 4th Jun 1991 |
| 192.111.35.0/24 | 256 | ARIN | US | 4th Jun 1991 |
| 192.111.44.0/24 | 256 | RIPE NCC |  CZ | 7th Jun 1991 |
| 192.111.45.0/24 | 256 | ARIN | US | 7th Jun 1991 |