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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.88.10.0/24 | 256 | RIPE NCC |  GB | 5th Dec 1990 |
| 192.88.103.0/24 | 256 | ARIN |  US | 8th Dec 2022 |
| 192.88.104.0/24 | 256 | ARIN | US | 13th Dec 1990 |
| 192.88.106.0/24 | 256 | ARIN | US | 12th Dec 1990 |
| 192.88.107.0/24 | 256 | ARIN | US | 12th Dec 1990 |
| 192.88.112.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.113.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.117.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.118.0/24 | 256 | RIPE NCC | GB | 17th Dec 1990 |
| 192.88.120.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.122.0/24 | 256 | ARIN | US | 17th Dec 1990 |
| 192.88.125.0/24 | 256 | ARIN | US | 26th Mar 1991 |
| 192.88.128.0/24 | 256 | RIPE NCC | GB | 19th Dec 1990 |
| 192.88.129.0/24 | 256 | ARIN | US | 30th Jun 1990 |
| 192.88.13.0/24 | 256 | ARIN | US | 5th Dec 1990 |
| 192.88.130.0/24 | 256 | RIPE NCC |  TH | 19th Dec 1990 |
| 192.88.131.0/24 | 256 | ARIN | US | 19th Dec 1990 |
| 192.88.133.0/24 | 256 | RIPE NCC | GB | 19th Dec 1990 |
| 192.88.14.0/24 | 256 | ARIN | US | 5th Dec 1990 |
| 192.88.143.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.144.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.145.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.146.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.147.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.148.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.149.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.150.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.151.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.152.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.153.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.154.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.156.0/22 | 1k | ARIN | US | 20th Dec 1990 |
| 192.88.160.0/20 | 4.1k | ARIN | US | 20th Dec 1990 |
| 192.88.176.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.177.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.184.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.185.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.186.0/24 | 256 | ARIN | US | 4th Feb 2015 |
| 192.88.188.0/24 | 256 | ARIN | US | 20th Dec 1990 |
| 192.88.196.0/24 | 256 | RIPE NCC |  IT | 20th Dec 1990 |
| 192.88.197.0/24 | 256 | ARIN | US | 2nd Jan 1991 |
| 192.88.2.0/24 | 256 | ARIN | US | 28th Nov 1990 |
| 192.88.200.0/24 | 256 | ARIN | US | 15th Jan 1991 |
| 192.88.203.0/24 | 256 | ARIN | US | 15th Jan 1991 |
| 192.88.206.0/24 | 256 | ARIN | US | 15th Jan 1991 |
| 192.88.207.0/24 | 256 | ARIN | US | 11th Jan 1991 |
| 192.88.208.0/24 | 256 | ARIN | US | 11th Jan 1991 |
| 192.88.211.0/24 | 256 | ARIN | US | 11th Jan 1991 |
| 192.88.213.0/24 | 256 | ARIN | US | 11th Jan 1991 |
| 192.88.214.0/24 | 256 | ARIN | US | 11th Jan 1991 |