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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,221 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.93.232.0/21 | 2k | RIPE NCC |  FR | 1st Jan 1984 |
| 192.93.64.0/19 | 8.2k | RIPE NCC | FR | 1st Jan 1984 |
| 192.94.10.0/24 | 256 | ARIN |  US | 7th Feb 1991 |
| 192.94.100.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.101.0/24 | 256 | ARIN | US | 22nd Feb 1991 |
| 192.94.11.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.111.0/24 | 256 | RIPE NCC |  GB | 22nd Feb 1991 |
| 192.94.112.0/22 | 1k | RIPE NCC | GB | 22nd Feb 1991 |
| 192.94.116.0/23 | 512 | RIPE NCC | GB | 22nd Feb 1991 |
| 192.94.12.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.121.0/24 | 256 | ARIN | US | 25th Feb 1991 |
| 192.94.122.0/24 | 256 | APNIC |  BN | 25th Feb 1991 |
| 192.94.125.0/24 | 256 | ARIN | US | 30th Jul 1991 |
| 192.94.127.0/24 | 256 | ARIN | US | 25th Feb 1991 |
| 192.94.13.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.14.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.148.0/24 | 256 | ARIN | US | 25th Feb 1991 |
| 192.94.149.0/24 | 256 | ARIN | US | 25th Feb 1991 |
| 192.94.15.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.150.0/24 | 256 | ARIN | US | 25th Feb 1991 |
| 192.94.151.0/24 | 256 | ARIN | US | 25th Feb 1991 |
| 192.94.153.0/24 | 256 | ARIN | US | 9th Feb 2015 |
| 192.94.154.0/24 | 256 | ARIN | US | 26th Feb 1991 |
| 192.94.155.0/24 | 256 | ARIN | US | 26th Feb 1991 |
| 192.94.156.0/22 | 1k | RIPE NCC |  DK | 26th Feb 1991 |
| 192.94.16.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.160.0/23 | 512 | RIPE NCC | DK | 26th Feb 1991 |
| 192.94.162.0/24 | 256 | RIPE NCC | DK | 26th Feb 1991 |
| 192.94.164.0/24 | 256 | ARIN | US | 6th Mar 1991 |
| 192.94.165.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.167.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.168.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.17.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.170.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.171.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.172.0/24 | 256 | RIPE NCC | GB | 28th Feb 1991 |
| 192.94.175.0/24 | 256 | RIPE NCC | FR | 28th Feb 1991 |
| 192.94.176.0/20 | 4.1k | RIPE NCC | FR | 28th Feb 1991 |
| 192.94.18.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.19.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.192.0/21 | 2k | RIPE NCC | FR | 28th Feb 1991 |
| 192.94.2.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.20.0/24 | 256 | ARIN | US | 7th Feb 1991 |
| 192.94.201.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.207.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.209.0/24 | 256 | APNIC |  AU | 28th Feb 1991 |
| 192.94.211.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.213.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.215.0/24 | 256 | ARIN | US | 28th Feb 1991 |
| 192.94.217.0/24 | 256 | ARIN | US | 5th Mar 1991 |