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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in United States
26,989 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 134.242.232.0/22 | 1k | APNIC |  US | 15th Aug 1989 |
| 134.242.236.0/23 | 512 | APNIC | US | 15th Aug 1989 |
| 134.242.238.0/24 | 256 | APNIC | US | 15th Aug 1989 |
| 134.242.240.0/20 | 4.1k | APNIC | US | 15th Aug 1989 |
| 134.242.26.0/23 | 512 | ARIN | US | 15th Aug 1989 |
| 134.242.28.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.32.0/20 | 4.1k | ARIN | US | 15th Aug 1989 |
| 134.242.48.0/22 | 1k | ARIN | US | 15th Aug 1989 |
| 134.242.56.0/21 | 2k | ARIN | US | 15th Aug 1989 |
| 134.242.96.0/21 | 2k | ARIN | US | 15th Aug 1989 |
| 134.248.0.0/16 | 65.5k | ARIN | US | 22nd Aug 1989 |
| 134.26.0.0/16 | 65.5k | ARIN | US | 20th Apr 1989 |
| 134.40.0.0/16 | 65.5k | ARIN | US | 2nd Jun 1992 |
| 134.44.0.0/16 | 65.5k | ARIN | US | 25th Apr 1989 |
| 134.45.0.0/16 | 65.5k | ARIN | US | 7th Aug 2026 |
| 134.46.0.0/16 | 65.5k | ARIN | US | 22nd Nov 1993 |
| 134.49.128.0/21 | 2k | ARIN | US | 30th Jun 2026 |
| 134.49.140.0/22 | 1k | ARIN | US | 6th Jul 2026 |
| 134.49.144.0/20 | 4.1k | ARIN | US | 14th Aug 2026 |
| 134.49.168.0/22 | 1k | ARIN | US | 11th Aug 2026 |
| 134.49.172.0/22 | 1k | ARIN | US | 28th Jul 2026 |
| 134.49.176.0/21 | 2k | ARIN | US | 26th Apr 1989 |
| 134.49.184.0/21 | 2k | ARIN | US | 11th Aug 2026 |
| 134.49.224.0/22 | 1k | ARIN | US | 26th Apr 1989 |
| 134.49.240.0/22 | 1k | ARIN | US | 26th Apr 1989 |
| 134.49.248.0/22 | 1k | ARIN | US | 8th May 2026 |
| 134.49.96.0/19 | 8.2k | ARIN | US | 19th Aug 2026 |
| 134.5.0.0/16 | 65.5k | ARIN | US | 11th Apr 1989 |
| 134.51.0.0/16 | 65.5k | ARIN | US | 1st May 1989 |
| 134.52.0.0/16 | 65.5k | ARIN | US | 1st May 1989 |
| 134.57.0.0/16 | 65.5k | ARIN | US | 3rd May 1989 |
| 134.65.198.0/23 | 512 | ARIN | US | 12th Jul 2022 |
| 134.72.0.0/16 | 65.5k | ARIN | US | 10th May 1989 |
| 134.77.0.0/16 | 65.5k | ARIN | US | 10th May 1989 |
| 134.82.0.0/19 | 8.2k | ARIN | US | 20th Feb 2026 |
| 134.82.32.0/19 | 8.2k | ARIN | US | 18th May 1989 |
| 134.82.96.0/20 | 4.1k | ARIN | US | 18th May 1989 |
| 134.85.0.0/16 | 65.5k | ARIN | US | 18th May 1989 |
| 135.100.0.0/15 | 131k | ARIN | US | 30th Apr 1996 |
| 135.102.0.0/16 | 65.5k | ARIN | US | 30th Apr 1996 |
| 135.104.0.0/16 | 65.5k | ARIN | US | 30th Apr 1996 |
| 135.107.0.0/16 | 65.5k | ARIN | US | 13th Apr 1989 |
| 135.108.0.0/16 | 65.5k | ARIN | US | 13th Apr 1989 |
| 135.110.0.0/16 | 65.5k | ARIN | US | 30th Apr 1996 |
| 135.113.0.0/16 | 65.5k | ARIN | US | 30th Apr 1996 |
| 135.124.0.0/16 | 65.5k | ARIN | US | 11th Oct 2000 |
| 135.128.0.0/16 | 65.5k | ARIN | US | 6th Jan 1994 |
| 135.132.128.0/20 | 4.1k | ARIN | US | 27th Jan 2026 |
| 135.132.160.0/20 | 4.1k | RIPE NCC | US | 6th Jan 1994 |
| 135.132.32.0/20 | 4.1k | RIPE NCC | US | 6th Jan 1994 |