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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2.255.0.0/17 | 32.8k | RIPE NCC |  SE | 30th Dec 2010 |
| 2.255.192.0/18 | 16.4k | RIPE NCC | SE | 30th Dec 2010 |
| 2.56.120.0/22 | 1k | RIPE NCC |  CY | 14th Mar 2019 |
| 2.56.144.0/22 | 1k | RIPE NCC |  VG | 14th Mar 2019 |
| 2.56.192.0/22 | 1k | RIPE NCC |  NL | 15th Mar 2019 |
| 2.56.44.0/22 | 1k | RIPE NCC |  BZ | 13th Mar 2019 |
| 2.56.48.0/22 | 1k | RIPE NCC |  RO | 13th Mar 2019 |
| 2.57.1.0/24 | 256 | RIPE NCC |  DE | 7th Mar 2023 |
| 2.57.112.0/22 | 1k | RIPE NCC |  RU | 19th Mar 2019 |
| 2.57.12.0/22 | 1k | RIPE NCC | NL | 15th Mar 2019 |
| 2.57.124.0/22 | 1k | APNIC |  TH | 19th Mar 2019 |
| 2.57.144.0/22 | 1k | RIPE NCC | DE | 19th Mar 2019 |
| 2.57.180.0/22 | 1k | RIPE NCC |  AT | 20th Mar 2019 |
| 2.57.32.0/22 | 1k | RIPE NCC |  IT | 15th Mar 2019 |
| 2.57.52.0/22 | 1k | RIPE NCC | RU | 18th Mar 2019 |
| 2.57.64.0/22 | 1k | RIPE NCC |  SK | 18th Mar 2019 |
| 2.57.8.0/23 | 512 | RIPE NCC |  PL | 15th Mar 2019 |
| 2.58.0.0/22 | 1k | RIPE NCC | SE | 21st Mar 2019 |
| 2.58.116.0/22 | 1k | RIPE NCC |  FR | 21st Mar 2019 |
| 2.58.146.0/23 | 512 | RIPE NCC | AT | 21st Mar 2019 |
| 2.58.156.0/22 | 1k | RIPE NCC |  IN | 22nd Mar 2019 |
| 2.58.213.0/24 | 256 | RIPE NCC | AT | 8th Jan 2025 |
| 2.58.215.0/24 | 256 | RIPE NCC |  ES | 8th Jan 2025 |
| 2.58.32.0/22 | 1k | RIPE NCC | DE | 21st Mar 2019 |
| 2.58.36.0/22 | 1k | RIPE NCC | DE | 21st Mar 2019 |
| 2.58.60.0/22 | 1k | RIPE NCC |  AE | 21st Mar 2019 |
| 2.58.98.0/24 | 256 | RIPE NCC | RU | 21st Mar 2019 |
| 2.59.116.0/24 | 256 | RIPE NCC | AT | 26th Mar 2019 |
| 2.59.128.0/22 | 1k | RIPE NCC | PL | 26th Mar 2019 |
| 2.59.172.0/22 | 1k | RIPE NCC | AT | 26th Mar 2019 |
| 2.59.196.0/22 | 1k | RIPE NCC |  HU | 27th Mar 2019 |
| 2.59.224.0/22 | 1k | RIPE NCC | IN | 27th Mar 2019 |
| 20.128.0.0/16 | 65.5k | ARIN |  US | 18th Oct 2017 |
| 20.130.0.0/16 | 65.5k | ARIN | US | 18th Oct 2017 |
| 20.144.0.0/14 | 262k | ARIN | US | 18th Oct 2017 |
| 20.176.0.0/14 | 262k | ARIN | US | 18th Oct 2017 |
| 20.180.0.0/14 | 262k | ARIN | US | 22nd Feb 2017 |
| 20.32.0.0/16 | 65.5k | ARIN | US | 4th Sept 1989 |
| 200.0.0.0/21 | 2k | LACNIC |  CO | 11th May 1993 |
| 200.0.103.0/24 | 256 | LACNIC |  MX | 26th Jul 1994 |
| 200.0.104.0/23 | 512 | LACNIC | MX | 26th Jul 1994 |
| 200.0.106.0/24 | 256 | LACNIC | MX | 26th Jul 1994 |
| 200.0.107.0/24 | 256 | LACNIC |  PE | 13th Oct 1994 |
| 200.0.108.0/24 | 256 | LACNIC |  CL | 13th Oct 1994 |
| 200.0.109.0/24 | 256 | LACNIC | MX | 21st Oct 1994 |
| 200.0.110.0/24 | 256 | LACNIC | PE | 8th Nov 1994 |
| 200.0.115.0/24 | 256 | LACNIC | CL | 23rd Nov 1994 |
| 200.0.120.0/24 | 256 | LACNIC | CL | 29th Dec 1994 |
| 200.0.121.0/24 | 256 | LACNIC | CL | 5th Jan 1995 |
| 200.0.122.0/23 | 512 | LACNIC | CL | 5th Jan 1995 |