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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,968 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 147.24.0.0/15 | 131k | ARIN |  US | 22nd Apr 1991 |
| 147.3.0.0/16 | 65.5k | ARIN | US | 12th Mar 1991 |
| 147.54.0.0/16 | 65.5k | RIPE NCC |  DE | 27th Jun 1991 |
| 147.61.0.0/16 | 65.5k | ARIN | US | 5th Jul 1991 |
| 147.7.0.0/16 | 65.5k | RIPE NCC |  HU | 11th Mar 1991 |
| 147.75.160.0/20 | 4.1k | RIPE NCC |  NL | 11th Jul 1991 |
| 147.75.208.0/20 | 4.1k | RIPE NCC |  IL | 11th Jul 1991 |
| 147.77.0.0/16 | 65.5k | RIPE NCC |  GB | 11th Jul 1991 |
| 147.78.104.0/22 | 1k | RIPE NCC |  BE | 18th Jan 2019 |
| 147.78.108.0/22 | 1k | RIPE NCC | DE | 18th Jan 2019 |
| 147.78.136.0/22 | 1k | RIPE NCC |  CH | 21st Jan 2019 |
| 147.78.152.0/22 | 1k | APNIC |  TH | 21st Jan 2019 |
| 147.78.156.0/22 | 1k | RIPE NCC |  SE | 21st Jan 2019 |
| 147.78.188.0/22 | 1k | RIPE NCC |  RU | 22nd Jan 2019 |
| 147.78.220.0/22 | 1k | RIPE NCC |  AT | 22nd Jan 2019 |
| 147.78.52.0/22 | 1k | RIPE NCC |  RO | 18th Jan 2019 |
| 147.78.72.0/22 | 1k | RIPE NCC |  DK | 18th Jan 2019 |
| 147.82.0.0/16 | 65.5k | RIPE NCC |  SA | 16th Jul 1991 |
| 147.89.0.0/16 | 65.5k | RIPE NCC | GB | 19th Jul 1991 |
| 147.93.212.0/24 | 256 | RIPE NCC | DE | 19th Jul 1991 |
| 148.110.0.0/16 | 65.5k | RIPE NCC |  LU | 28th Mar 1991 |
| 148.117.0.0/16 | 65.5k | ARIN |  CA | 2nd Apr 1991 |
| 148.127.0.0/16 | 65.5k | ARIN | US | 9th Apr 1991 |
| 148.130.0.0/16 | 65.5k | ARIN | US | 9th Apr 1991 |
| 148.131.0.0/16 | 65.5k | ARIN | US | 11th Apr 1991 |
| 148.132.0.0/16 | 65.5k | ARIN | US | 11th Apr 1991 |
| 148.133.0.0/16 | 65.5k | ARIN | US | 11th Apr 1991 |
| 148.138.0.0/16 | 65.5k | RIPE NCC | SE | 1st Sept 1993 |
| 148.140.0.0/16 | 65.5k | RIPE NCC |  NO | 1st Sept 1993 |
| 148.145.0.0/17 | 32.8k | APNIC |  AU | 18th Apr 1991 |
| 148.146.0.0/16 | 65.5k | ARIN | US | 18th Apr 1991 |
| 148.148.0.0/16 | 65.5k | RIPE NCC | NL | 1st Sept 1993 |
| 148.151.0.0/16 | 65.5k | RIPE NCC |  OM | 1st Sept 1993 |
| 148.152.0.0/16 | 65.5k | ARIN | US | 24th Apr 1991 |
| 148.155.0.0/16 | 65.5k | ARIN | US | 30th Apr 1991 |
| 148.157.0.0/16 | 65.5k | ARIN | US | 30th Apr 1991 |
| 148.158.0.0/16 | 65.5k | ARIN | US | 30th Apr 1991 |
| 148.16.0.0/12 | 1M | ARIN | US | 13th Mar 1991 |
| 148.161.0.0/16 | 65.5k | APNIC |  JP | 2nd May 1991 |
| 148.163.188.0/22 | 1k | ARIN | US | 5th Jun 2018 |
| 148.171.0.0/16 | 65.5k | ARIN | US | 9th May 1991 |
| 148.172.0.0/16 | 65.5k | ARIN | US | 9th May 1991 |
| 148.174.0.0/16 | 65.5k | ARIN | US | 13th May 1991 |
| 148.175.0.0/16 | 65.5k | ARIN | US | 1st Dec 1995 |
| 148.176.0.0/16 | 65.5k | RIPE NCC | GB | 1st Sept 1993 |
| 148.180.0.0/16 | 65.5k | ARIN | US | 15th Apr 1991 |
| 148.181.0.0/16 | 65.5k | RIPE NCC | GB | 16th May 1991 |
| 148.183.0.0/16 | 65.5k | ARIN | US | 16th May 1991 |
| 148.185.0.0/16 | 65.5k | RIPE NCC | GB | 1st Sept 1993 |
| 148.189.0.0/16 | 65.5k | ARIN | US | 22nd May 1991 |