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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,968 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 134.242.208.0/20 | 4.1k | ARIN |  US | 15th Aug 1989 |
| 134.242.23.0/24 | 256 | ARIN | US | 15th Aug 1989 |
| 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 |
| 134.242.239.0/24 | 256 | RIPE NCC |  FR | 30th Mar 2016 |
| 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 |
| 134.255.196.0/23 | 512 | RIPE NCC |  IR | 8th Nov 2011 |
| 134.255.241.0/24 | 256 | RIPE NCC |  ES | 8th Nov 2011 |
| 134.255.245.0/24 | 256 | RIPE NCC | IR | 8th Nov 2011 |
| 134.255.246.0/24 | 256 | RIPE NCC | IR | 8th Nov 2011 |
| 134.26.0.0/16 | 65.5k | ARIN | US | 20th Apr 1989 |
| 134.27.0.0/16 | 65.5k | RIPE NCC |  NL | 22nd Aug 2007 |
| 134.40.0.0/16 | 65.5k | ARIN | US | 2nd Jun 1992 |
| 134.42.225.0/24 | 256 | APNIC |  SG | 25th Apr 1989 |
| 134.42.226.0/24 | 256 | APNIC |  AU | 25th Apr 1989 |
| 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 |
| 134.49.160.0/21 | 2k | RIPE NCC |  DE | 26th Apr 1989 |
| 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 |
| 134.49.232.0/21 | 2k | RIPE NCC |  CA | 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 |
| 134.49.64.0/19 | 8.2k | RIPE NCC | NL | 29th Apr 1989 |
| 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 |
| 134.65.0.0/21 | 2k | ARIN |  GB | 30th Jul 1990 |
| 134.65.112.0/21 | 2k | APNIC | SG | 30th Jul 1990 |
| 134.65.124.0/23 | 512 | APNIC | SG | 30th Jul 1990 |
| 134.65.173.0/24 | 256 | ARIN | GB | 30th Jul 1990 |
| 134.65.186.0/23 | 512 | ARIN | GB | 30th Jul 1990 |
| 134.65.196.0/24 | 256 | ARIN | GB | 30th Jul 1990 |