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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.140.0.0/24 | 256 | ARIN |  US | 25th Jun 2020 |
| 192.140.128.0/22 | 1k | APNIC |  CN | 2nd Apr 2016 |
| 192.140.132.0/22 | 1k | APNIC | CN | 2nd Apr 2016 |
| 192.140.136.0/22 | 1k | APNIC | CN | 2nd Apr 2016 |
| 192.140.156.0/22 | 1k | APNIC | CN | 4th Apr 2016 |
| 192.140.192.0/22 | 1k | APNIC | CN | 4th Apr 2016 |
| 192.140.196.0/22 | 1k | APNIC | CN | 4th Apr 2016 |
| 192.140.200.0/22 | 1k | APNIC | CN | 4th Apr 2016 |
| 192.140.204.0/22 | 1k | APNIC | CN | 4th Apr 2016 |
| 192.140.232.0/22 | 1k | APNIC |  AU | 5th Apr 2016 |
| 192.144.24.0/22 | 1k | RIPE NCC |  RO | 23rd Nov 2018 |
| 192.144.28.0/24 | 256 | RIPE NCC |  RU | 23rd Nov 2018 |
| 192.144.44.0/22 | 1k | RIPE NCC |  CZ | 26th Nov 2018 |
| 192.144.74.0/24 | 256 | RIPE NCC |  FR | 14th May 1992 |
| 192.144.84.0/23 | 512 | LACNIC |  MX | 27th Feb 2023 |
| 192.145.100.0/22 | 1k | RIPE NCC | RO | 10th Dec 2018 |
| 192.145.120.0/22 | 1k | RIPE NCC |  PS | 11th Dec 2018 |
| 192.145.176.0/22 | 1k | AFRINIC |  CI | 28th Feb 2020 |
| 192.145.20.0/22 | 1k | APNIC |  TH | 7th Dec 2018 |
| 192.145.230.0/24 | 256 | AFRINIC | CI | 28th Feb 2020 |
| 192.145.52.0/22 | 1k | RIPE NCC |  GB | 10th Dec 2018 |
| 192.145.88.0/22 | 1k | RIPE NCC |  DE | 10th Dec 2018 |
| 192.146.100.0/24 | 256 | ARIN | US | 14th May 1992 |
| 192.146.102.0/24 | 256 | ARIN | US | 22nd Jan 1992 |
| 192.146.103.0/24 | 256 | ARIN | US | 22nd Jan 1992 |
| 192.146.104.0/24 | 256 | ARIN | US | 24th Jan 1992 |
| 192.146.105.0/24 | 256 | ARIN | US | 22nd Jan 1992 |
| 192.146.106.0/24 | 256 | ARIN | US | 22nd Jan 1992 |
| 192.146.107.0/24 | 256 | ARIN | US | 22nd Jan 1992 |
| 192.146.108.0/24 | 256 | ARIN | US | 22nd Jan 1992 |
| 192.146.113.0/24 | 256 | ARIN | US | 14th May 2015 |
| 192.146.114.0/24 | 256 | ARIN | US | 23rd Jan 1992 |
| 192.146.117.0/24 | 256 | RIPE NCC |  DK | 23rd Jan 1992 |
| 192.146.119.0/24 | 256 | RIPE NCC | FR | 23rd Jan 1992 |
| 192.146.120.0/24 | 256 | ARIN | US | 23rd Jan 1992 |
| 192.146.121.0/24 | 256 | ARIN | US | 23rd Jan 1992 |
| 192.146.122.0/24 | 256 | ARIN | US | 13th May 1992 |
| 192.146.123.0/24 | 256 | RIPE NCC | GB | 24th Jan 1992 |
| 192.146.124.0/23 | 512 | RIPE NCC |  ES | 24th Jan 1992 |
| 192.146.126.0/24 | 256 | RIPE NCC | ES | 24th Jan 1992 |
| 192.146.127.0/24 | 256 | ARIN | US | 24th Jan 1992 |
| 192.146.128.0/24 | 256 | ARIN | US | 24th Jan 1992 |
| 192.146.129.0/24 | 256 | ARIN | US | 24th Jan 1992 |
| 192.146.132.0/24 | 256 | RIPE NCC |  AT | 28th Jan 1992 |
| 192.146.133.0/24 | 256 | APNIC |  SG | 28th Jan 1992 |
| 192.146.143.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.146.144.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.146.145.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.146.146.0/24 | 256 | ARIN | US | 28th Jan 1992 |
| 192.146.147.0/24 | 256 | ARIN | US | 28th Jan 1992 |