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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,201 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.26.216.0/24 | 256 | APNIC |  AU | 17th May 1990 |
| 192.26.217.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.218.0/23 | 512 | APNIC | AU | 17th May 1990 |
| 192.26.22.0/24 | 256 | ARIN |  US | 28th Apr 2023 |
| 192.26.220.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.221.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.222.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.223.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.224.0/23 | 512 | APNIC | AU | 17th May 1990 |
| 192.26.226.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.227.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.228.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.229.0/24 | 256 | APNIC | AU | 17th May 1990 |
| 192.26.23.0/24 | 256 | ARIN | US | 28th Apr 2023 |
| 192.26.234.0/24 | 256 | RIPE NCC |  GB | 1st Jan 1984 |
| 192.26.24.0/24 | 256 | ARIN | US | 28th Apr 2023 |
| 192.26.248.0/24 | 256 | ARIN | US | 20th Mar 1989 |
| 192.26.255.0/24 | 256 | ARIN | US | 4th Apr 2014 |
| 192.26.3.0/24 | 256 | ARIN | US | 9th Sept 1986 |
| 192.26.4.0/24 | 256 | ARIN | US | 9th Sept 1986 |
| 192.26.45.0/24 | 256 | RIPE NCC | GB | 2nd Nov 1993 |
| 192.26.48.0/24 | 256 | ARIN | US | 12th Feb 1988 |
| 192.26.49.0/24 | 256 | ARIN | US | 19th Apr 1989 |
| 192.26.5.0/24 | 256 | ARIN | US | 9th Sept 1986 |
| 192.26.6.0/24 | 256 | ARIN | US | 9th Sept 1986 |
| 192.26.8.0/24 | 256 | ARIN | US | 20th Oct 1986 |
| 192.26.82.0/24 | 256 | ARIN | US | 17th Dec 1986 |
| 192.26.83.0/24 | 256 | ARIN | US | 23rd Dec 1986 |
| 192.26.88.0/24 | 256 | ARIN | US | 7th Jan 1987 |
| 192.26.90.0/24 | 256 | ARIN | US | 28th Jan 1987 |
| 192.26.95.0/24 | 256 | ARIN | US | 19th Feb 1987 |
| 192.26.96.0/24 | 256 | APNIC |  JP | 26th Feb 1987 |
| 192.26.97.0/24 | 256 | ARIN | US | 26th Feb 1987 |
| 192.28.100.0/22 | 1k | ARIN | US | 16th Feb 1988 |
| 192.28.104.0/22 | 1k | ARIN | US | 16th Feb 1988 |
| 192.28.108.0/23 | 512 | ARIN | US | 16th Feb 1988 |
| 192.28.110.0/23 | 512 | ARIN | US | 16th Feb 1988 |
| 192.28.112.0/21 | 2k | ARIN | US | 16th Feb 1988 |
| 192.28.132.0/22 | 1k | ARIN | US | 16th Feb 1988 |
| 192.28.136.0/22 | 1k | ARIN | US | 16th Feb 1988 |
| 192.28.140.0/22 | 1k | ARIN | US | 16th Feb 1988 |
| 192.28.192.0/18 | 16.4k | ARIN | US | 16th Feb 1988 |
| 192.30.0.0/19 | 8.2k | ARIN | US | 23rd Oct 2012 |
| 192.30.104.0/22 | 1k | ARIN | US | 9th Nov 2012 |
| 192.30.108.0/24 | 256 | ARIN | US | 10th Mar 1987 |
| 192.30.110.0/23 | 512 | ARIN | US | 18th Jul 2014 |
| 192.30.113.0/24 | 256 | ARIN | US | 16th Jun 2001 |
| 192.30.114.0/24 | 256 | ARIN | US | 10th Apr 2014 |
| 192.30.122.0/24 | 256 | ARIN | US | 16th Jun 2001 |
| 192.30.125.0/24 | 256 | ARIN | US | 10th Mar 1987 |