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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 192.132.49.0/24 | 256 | ARIN |  US | 12th Nov 1991 |
| 192.132.50.0/24 | 256 | ARIN | US | 12th Nov 1991 |
| 192.132.51.0/24 | 256 | ARIN | US | 12th Nov 1991 |
| 192.132.52.0/24 | 256 | ARIN | US | 12th Nov 1991 |
| 192.132.54.0/24 | 256 | ARIN | US | 12th Nov 1991 |
| 192.132.57.0/24 | 256 | ARIN | US | 12th Nov 1991 |
| 192.132.59.0/24 | 256 | ARIN | US | 14th Apr 2015 |
| 192.132.6.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.60.0/24 | 256 | ARIN |  CA | 12th Nov 1991 |
| 192.132.65.0/24 | 256 | ARIN | US | 13th Nov 1991 |
| 192.132.66.0/24 | 256 | ARIN | US | 13th Nov 1991 |
| 192.132.67.0/24 | 256 | ARIN | US | 4th May 1992 |
| 192.132.68.0/24 | 256 | ARIN | US | 13th Nov 1991 |
| 192.132.69.0/24 | 256 | ARIN | US | 13th Nov 1991 |
| 192.132.70.0/24 | 256 | ARIN | US | 13th Nov 1991 |
| 192.132.71.0/24 | 256 | ARIN | US | 26th Nov 1991 |
| 192.132.72.0/24 | 256 | ARIN | US | 4th May 1992 |
| 192.132.73.0/24 | 256 | ARIN | US | 13th Nov 1991 |
| 192.132.74.0/24 | 256 | ARIN | US | 13th Nov 1991 |
| 192.132.75.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.76.0/24 | 256 | ARIN | US | 15th Nov 1991 |
| 192.132.77.0/24 | 256 | ARIN | US | 15th Nov 1991 |
| 192.132.78.0/24 | 256 | ARIN | US | 15th Nov 1991 |
| 192.132.79.0/24 | 256 | ARIN | US | 30th Dec 1991 |
| 192.132.80.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.132.82.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.132.89.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.9.0/24 | 256 | RIPE NCC |  GB | 5th Nov 1991 |
| 192.132.90.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.91.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.92.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.95.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.97.0/24 | 256 | ARIN | US | 29th Mar 1992 |
| 192.132.98.0/24 | 256 | ARIN | US | 14th Nov 1991 |
| 192.132.99.0/24 | 256 | RIPE NCC | GB | 14th Nov 1991 |
| 192.133.10.0/24 | 256 | APNIC |  TH | 11th Feb 2011 |
| 192.133.100.0/24 | 256 | ARIN | US | 25th Nov 1991 |
| 192.133.102.0/24 | 256 | ARIN | US | 29th Nov 1991 |
| 192.133.118.0/23 | 512 | ARIN | US | 22nd Jan 1996 |
| 192.133.120.0/24 | 256 | ARIN | US | 6th Dec 1991 |
| 192.133.121.0/24 | 256 | RIPE NCC |  SE | 9th Dec 1991 |
| 192.133.122.0/24 | 256 | ARIN | US | 9th Dec 1991 |
| 192.133.123.0/24 | 256 | ARIN | US | 9th Dec 1991 |
| 192.133.124.0/24 | 256 | ARIN | US | 9th Dec 1991 |
| 192.133.127.0/24 | 256 | ARIN | US | 9th Dec 1991 |
| 192.133.13.0/24 | 256 | ARIN | US | 11th Jun 2015 |
| 192.133.130.0/24 | 256 | ARIN | US | 9th Dec 1991 |
| 192.133.131.0/24 | 256 | RIPE NCC | GB | 9th Dec 1991 |
| 192.133.132.0/24 | 256 | ARIN | US | 9th Dec 1991 |
| 192.133.133.0/24 | 256 | ARIN | US | 9th Dec 1991 |