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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.251.92.0/24 | 256 | ARIN |  US | 25th Nov 1992 |
| 192.251.96.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.251.98.0/24 | 256 | ARIN | US | 27th Nov 1992 |
| 192.252.16.0/20 | 4.1k | ARIN | US | 6th Nov 1992 |
| 192.252.240.0/20 | 4.1k | ARIN | US | 14th Jul 2022 |
| 192.252.32.0/19 | 8.2k | ARIN | US | 12th Nov 1992 |
| 192.254.32.0/19 | 8.2k | ARIN | US | 20th Nov 1992 |
| 192.26.1.0/24 | 256 | ARIN | US | 9th Sept 1986 |
| 192.26.100.0/24 | 256 | ARIN | US | 23rd Dec 1986 |
| 192.26.101.0/24 | 256 | ARIN | US | 23rd Dec 1986 |
| 192.26.102.0/24 | 256 | ARIN | US | 23rd Dec 1986 |
| 192.26.105.0/24 | 256 | RIPE NCC |  FI | 16th Jan 1987 |
| 192.26.106.0/24 | 256 | RIPE NCC | FI | 12th Jan 1993 |
| 192.26.107.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.108.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.109.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.112.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.113.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.114.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.115.0/24 | 256 | RIPE NCC | FI | 13th Apr 1994 |
| 192.26.116.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.117.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.118.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.120.0/24 | 256 | RIPE NCC | FI | 2nd Jun 1993 |
| 192.26.121.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.122.0/24 | 256 | RIPE NCC | FI | 12th Jan 1993 |
| 192.26.124.0/24 | 256 | RIPE NCC | FI | 30th Oct 1992 |
| 192.26.125.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.126.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.127.0/24 | 256 | RIPE NCC | FI | 1st Jan 1984 |
| 192.26.128.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.133.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.134.0/24 | 256 | RIPE NCC | FI | 16th Jan 1987 |
| 192.26.135.0/24 | 256 | RIPE NCC | FI | 14th Jan 1996 |
| 192.26.138.0/23 | 512 | ARIN | US | 25th Jul 2017 |
| 192.26.147.0/24 | 256 | ARIN | US | 26th Feb 1987 |
| 192.26.148.0/24 | 256 | ARIN | US | 26th Feb 1987 |
| 192.26.151.0/24 | 256 | ARIN | US | 26th Feb 1987 |
| 192.26.152.0/24 | 256 | ARIN | US | 9th Jul 1993 |
| 192.26.153.0/24 | 256 | ARIN | US | 24th Apr 1990 |
| 192.26.154.0/23 | 512 | RIPE NCC |  NL | 2nd Feb 1989 |
| 192.26.160.0/21 | 2k | RIPE NCC | NL | 2nd Feb 1989 |
| 192.26.172.0/23 | 512 | RIPE NCC | NL | 2nd Feb 1989 |
| 192.26.2.0/24 | 256 | ARIN | US | 9th Sept 1986 |
| 192.26.201.0/24 | 256 | ARIN | US | 13th Mar 1989 |
| 192.26.202.0/23 | 512 | ARIN | US | 13th Mar 1989 |
| 192.26.204.0/22 | 1k | ARIN | US | 13th Mar 1989 |
| 192.26.208.0/23 | 512 | ARIN | US | 13th Mar 1989 |
| 192.26.211.0/24 | 256 | ARIN |  CA | 4th Nov 1990 |
| 192.26.213.0/24 | 256 | ARIN | US | 30th May 1990 |