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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 144.16.114.0/23 | 512 | APNIC |  IN | 6th Nov 1990 |
| 144.16.116.0/22 | 1k | APNIC | IN | 6th Nov 1990 |
| 144.16.120.0/21 | 2k | APNIC | IN | 6th Nov 1990 |
| 144.16.64.0/19 | 8.2k | APNIC | IN | 6th Nov 1990 |
| 144.16.96.0/20 | 4.1k | APNIC | IN | 6th Nov 1990 |
| 144.165.0.0/16 | 65.5k | RIPE NCC |  FR | 1st Apr 2005 |
| 144.176.0.0/16 | 65.5k | RIPE NCC |  NO | 17th Dec 1990 |
| 144.178.117.0/24 | 256 | RIPE NCC |  CH | 2nd Dec 1992 |
| 144.178.254.0/24 | 256 | RIPE NCC | CH | 2nd Dec 1992 |
| 144.179.0.0/16 | 65.5k | RIPE NCC | NO | 17th Dec 1990 |
| 144.180.0.0/16 | 65.5k | RIPE NCC | NO | 17th Dec 1990 |
| 144.181.0.0/16 | 65.5k | RIPE NCC | NO | 17th Dec 1990 |
| 144.184.0.0/16 | 65.5k | ARIN |  US | 20th Dec 1990 |
| 144.187.0.0/16 | 65.5k | ARIN | US | 20th Dec 1990 |
| 144.189.0.0/16 | 65.5k | ARIN | US | 20th Dec 1990 |
| 144.197.0.0/16 | 65.5k | ARIN | US | 20th Dec 1990 |
| 144.2.172.0/22 | 1k | RIPE NCC |  NL | 1st Sept 1993 |
| 144.2.192.0/19 | 8.2k | RIPE NCC | US | 1st Sept 1993 |
| 144.201.0.0/16 | 65.5k | ARIN | US | 20th Dec 1990 |
| 144.208.109.0/24 | 256 | ARIN | US | 23rd Jul 2018 |
| 144.208.90.0/24 | 256 | ARIN | US | 13th Feb 2020 |
| 144.210.0.0/16 | 65.5k | ARIN | US | 15th Jan 1991 |
| 144.215.0.0/16 | 65.5k | ARIN | US | 15th Jan 1991 |
| 144.219.0.0/16 | 65.5k | ARIN | US | 11th Jan 1991 |
| 144.220.0.0/16 | 65.5k | ARIN | US | 27th Apr 2018 |
| 144.221.0.0/16 | 65.5k | ARIN | US | 11th Jan 1991 |
| 144.222.0.0/16 | 65.5k | ARIN | US | 11th Jan 1991 |
| 144.227.0.0/16 | 65.5k | ARIN | US | 6th Jan 1994 |
| 144.23.0.0/16 | 65.5k | LACNIC |  CR | 6th Nov 1990 |
| 144.231.0.0/16 | 65.5k | ARIN | US | 11th Jan 1991 |
| 144.247.0.0/16 | 65.5k | ARIN | US | 11th Jan 1990 |
| 144.249.0.0/17 | 32.8k | RIPE NCC | US | 11th Jan 1991 |
| 144.249.224.0/20 | 4.1k | APNIC |  NZ | 11th Jan 1991 |
| 144.28.0.0/16 | 65.5k | ARIN | US | 9th Nov 1990 |
| 144.34.16.0/21 | 2k | ARIN | US | 16th May 2024 |
| 144.34.24.0/21 | 2k | ARIN | US | 9th Nov 1990 |
| 144.34.40.0/21 | 2k | ARIN | US | 16th May 2024 |
| 144.34.88.0/21 | 2k | ARIN | US | 16th May 2024 |
| 144.36.104.0/24 | 256 | APNIC | IN | 9th Nov 1990 |
| 144.36.105.0/24 | 256 | ARIN | US | 9th Nov 1990 |
| 144.36.106.0/23 | 512 | ARIN | US | 9th Nov 1990 |
| 144.36.128.0/23 | 512 | APNIC | IN | 9th Nov 1990 |
| 144.36.132.0/23 | 512 | ARIN | US | 9th Nov 1990 |
| 144.36.142.0/23 | 512 | ARIN | US | 9th Nov 1990 |
| 144.36.144.0/23 | 512 | APNIC | IN | 9th Nov 1990 |
| 144.36.148.0/23 | 512 | APNIC | IN | 9th Nov 1990 |
| 144.36.152.0/21 | 2k | ARIN | US | 9th Nov 1990 |
| 144.36.176.0/24 | 256 | APNIC | IN | 9th Nov 1990 |
| 144.36.177.0/24 | 256 | ARIN | US | 9th Nov 1990 |
| 144.36.178.0/24 | 256 | APNIC | IN | 9th Nov 1990 |