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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 146.19.75.0/24 | 256 | RIPE NCC |  MD | 12th Nov 2021 |
| 146.19.8.0/24 | 256 | RIPE NCC |  DE | 10th Nov 2021 |
| 146.19.80.0/24 | 256 | RIPE NCC | MD | 12th Nov 2021 |
| 146.196.100.0/22 | 1k | APNIC |  US | 22nd Mar 2016 |
| 146.196.124.0/22 | 1k | APNIC |  CN | 22nd Mar 2016 |
| 146.196.72.0/22 | 1k | APNIC | CN | 21st Mar 2016 |
| 146.196.92.0/22 | 1k | APNIC | CN | 22nd Mar 2016 |
| 146.204.0.0/15 | 131k | ARIN | US | 28th Feb 1991 |
| 146.208.0.0/16 | 65.5k | ARIN | US | 2nd Dec 1994 |
| 146.221.0.0/16 | 65.5k | APNIC |  AU | 28th Feb 1991 |
| 146.223.0.0/16 | 65.5k | ARIN | US | 24th Aug 1994 |
| 146.224.0.0/16 | 65.5k | RIPE NCC |  NO | 28th Feb 1991 |
| 146.237.0.0/16 | 65.5k | ARIN | US | 5th Mar 1991 |
| 146.238.0.0/16 | 65.5k | ARIN | US | 5th Mar 1991 |
| 146.239.0.0/16 | 65.5k | ARIN | US | 5th Mar 1991 |
| 146.24.0.0/13 | 524k | ARIN | US | 18th Jan 1991 |
| 146.247.40.0/21 | 2k | RIPE NCC |  IE | 14th Jul 2011 |
| 146.248.0.0/16 | 65.5k | RIPE NCC |  CH | 6th Mar 1991 |
| 146.252.0.0/16 | 65.5k | ARIN | US | 6th Mar 1991 |
| 146.254.0.0/16 | 65.5k | RIPE NCC | DE | 11th Dec 1991 |
| 146.255.120.0/21 | 2k | RIPE NCC | DE | 20th Jul 2011 |
| 146.255.73.0/24 | 256 | RIPE NCC |  MK | 19th Jul 2011 |
| 146.255.86.0/24 | 256 | RIPE NCC | MK | 19th Jul 2011 |
| 146.255.94.0/23 | 512 | RIPE NCC | MK | 19th Jul 2011 |
| 146.3.0.0/16 | 65.5k | RIPE NCC |  LU | 15th Jan 1991 |
| 146.32.0.0/13 | 524k | ARIN | US | 18th Jan 1991 |
| 146.40.0.0/14 | 262k | ARIN | US | 18th Jan 1991 |
| 146.44.0.0/15 | 131k | ARIN | US | 18th Jan 1991 |
| 146.46.0.0/16 | 65.5k | ARIN | US | 18th Jan 1991 |
| 146.47.0.0/16 | 65.5k | ARIN | US | 18th Jan 1991 |
| 146.51.0.0/16 | 65.5k | APNIC |  JP | 18th Jan 1991 |
| 146.61.0.0/16 | 65.5k | ARIN | US | 21st Jan 1991 |
| 146.66.128.0/22 | 1k | RIPE NCC |  IR | 12th Jul 2011 |
| 146.66.132.0/23 | 512 | RIPE NCC | IR | 12th Jul 2011 |
| 146.69.0.0/16 | 65.5k | ARIN | US | 23rd Jan 1991 |
| 146.71.128.0/17 | 32.8k | ARIN | US | 23rd Jan 1991 |
| 146.73.0.0/16 | 65.5k | ARIN | US | 23rd Jan 1991 |
| 146.84.0.0/17 | 32.8k | ARIN | US | 28th Jan 1991 |
| 146.84.128.0/17 | 32.8k | ARIN | US | 28th Jan 1991 |
| 146.88.144.0/23 | 512 | APNIC | AU | 28th Jan 1991 |
| 146.88.146.0/23 | 512 | APNIC |  NZ | 28th Jan 1991 |
| 146.88.19.0/24 | 256 | APNIC |  NL | 28th Jan 1991 |
| 146.89.0.0/16 | 65.5k | ARIN | US | 2nd Apr 1996 |
| 147.101.0.0/16 | 65.5k | ARIN | US | 11th Mar 1991 |
| 147.107.0.0/16 | 65.5k | ARIN | US | 14th Mar 1991 |
| 147.112.0.0/16 | 65.5k | RIPE NCC | NO | 19th Mar 1991 |
| 147.113.0.0/16 | 65.5k | ARIN | US | 19th Mar 1991 |
| 147.119.0.0/16 | 65.5k | RIPE NCC |  GB | 25th Nov 1992 |
| 147.12.96.0/19 | 8.2k | RIPE NCC | DE | 28th Mar 1991 |
| 147.121.0.0/16 | 65.5k | ARIN | US | 26th Mar 1991 |