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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,001 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 157.162.0.0/16 | 65.5k | RIPE NCC |  DE | 7th Apr 2004 |
| 157.163.0.0/16 | 65.5k | RIPE NCC | DE | 30th Dec 1991 |
| 157.169.0.0/16 | 65.5k | RIPE NCC |  FR | 7th Apr 2004 |
| 157.170.0.0/16 | 65.5k | ARIN |  US | 16th Jan 1992 |
| 157.171.0.0/16 | 65.5k | RIPE NCC |  SE | 7th Apr 2004 |
| 157.173.32.0/19 | 8.2k | RIPE NCC |  GB | 1st Sept 1993 |
| 157.173.64.0/20 | 4.1k | RIPE NCC | GB | 1st Sept 1993 |
| 157.173.8.0/21 | 2k | RIPE NCC |  ES | 1st Sept 1993 |
| 157.180.128.0/19 | 8.2k | RIPE NCC | SE | 7th Apr 2004 |
| 157.180.160.0/20 | 4.1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.180.176.0/21 | 2k | RIPE NCC | SE | 7th Apr 2004 |
| 157.180.184.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.180.188.0/22 | 1k | RIPE NCC | DE | 7th Apr 2004 |
| 157.180.200.0/21 | 2k | RIPE NCC | SE | 7th Apr 2004 |
| 157.180.208.0/22 | 1k | RIPE NCC | SE | 7th Apr 2004 |
| 157.180.212.0/23 | 512 | RIPE NCC | SE | 7th Apr 2004 |
| 157.183.0.0/16 | 65.5k | ARIN | US | 22nd Jan 1992 |
| 157.184.0.0/16 | 65.5k | ARIN | US | 22nd Jan 1992 |
| 157.186.0.0/16 | 65.5k | RIPE NCC |  RU | 7th Apr 2004 |
| 157.189.0.0/16 | 65.5k | ARIN | US | 23rd Jan 1992 |
| 157.194.0.0/16 | 65.5k | ARIN | US | 24th Jan 1992 |
| 157.195.0.0/16 | 65.5k | ARIN | US | 24th Jan 1992 |
| 157.196.0.0/16 | 65.5k | ARIN | US | 24th Jan 1992 |
| 157.198.0.0/16 | 65.5k | ARIN | US | 28th Jan 1992 |
| 157.20.136.0/23 | 512 | APNIC |  CN | 29th Feb 2024 |
| 157.20.153.0/24 | 256 | APNIC |  IN | 5th Mar 2024 |
| 157.20.154.0/23 | 512 | APNIC |  ID | 5th Mar 2024 |
| 157.20.164.0/23 | 512 | APNIC | ID | 5th Mar 2024 |
| 157.20.167.0/24 | 256 | APNIC | ID | 9th Mar 2024 |
| 157.20.194.0/23 | 512 | APNIC | CN | 12th Mar 2024 |
| 157.20.216.0/24 | 256 | APNIC | IN | 15th Mar 2024 |
| 157.20.230.0/23 | 512 | APNIC | ID | 19th Mar 2024 |
| 157.20.234.0/23 | 512 | APNIC | ID | 19th Mar 2024 |
| 157.20.245.0/24 | 256 | APNIC | ID | 22nd Mar 2024 |
| 157.20.40.0/23 | 512 | APNIC |  MM | 16th Feb 2024 |
| 157.20.62.0/23 | 512 | APNIC |  VN | 19th Feb 2024 |
| 157.20.70.0/23 | 512 | APNIC | ID | 20th Feb 2024 |
| 157.20.72.0/23 | 512 | APNIC | ID | 20th Feb 2024 |
| 157.20.78.0/23 | 512 | APNIC | ID | 21st Feb 2024 |
| 157.207.128.0/17 | 32.8k | ARIN | US | 28th Jan 1992 |
| 157.207.36.0/22 | 1k | ARIN | US | 28th Jan 1992 |
| 157.207.40.0/21 | 2k | ARIN | US | 28th Jan 1992 |
| 157.207.48.0/20 | 4.1k | ARIN | US | 28th Jan 1992 |
| 157.207.68.0/22 | 1k | ARIN | US | 28th Jan 1992 |
| 157.207.72.0/21 | 2k | ARIN | US | 28th Jan 1992 |
| 157.207.80.0/20 | 4.1k | ARIN | US | 28th Jan 1992 |
| 157.207.96.0/19 | 8.2k | ARIN | US | 28th Jan 1992 |
| 157.208.128.0/17 | 32.8k | ARIN | US | 8th Jan 1992 |
| 157.208.64.0/18 | 16.4k | ARIN | US | 8th Jan 1992 |
| 157.209.0.0/16 | 65.5k | ARIN | US | 29th Jan 1992 |