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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,075 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 182.236.128.0/17 | 32.8k | APNIC |  CN | 27th Apr 2010 |
| 182.237.128.0/18 | 16.4k | APNIC |  IN | 4th May 2010 |
| 182.237.24.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 182.237.28.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 182.238.0.0/16 | 65.5k | APNIC | CN | 4th May 2010 |
| 182.239.0.0/19 | 8.2k | APNIC | CN | 5th May 2010 |
| 182.252.128.0/21 | 2k | APNIC |  KR | 7th May 2010 |
| 182.252.136.0/22 | 1k | APNIC | KR | 7th May 2010 |
| 182.252.144.0/20 | 4.1k | APNIC | KR | 7th May 2010 |
| 182.252.160.0/20 | 4.1k | APNIC | KR | 7th May 2010 |
| 182.252.184.0/21 | 2k | APNIC | KR | 7th May 2010 |
| 182.252.192.0/18 | 16.4k | APNIC | KR | 7th May 2010 |
| 182.252.96.0/19 | 8.2k | APNIC |  SG | 7th May 2010 |
| 182.255.128.0/18 | 16.4k | APNIC | KR | 11th May 2010 |
| 182.255.16.0/22 | 1k | APNIC |  ID | 12th May 2010 |
| 182.255.192.0/18 | 16.4k | APNIC | KR | 11th May 2010 |
| 182.255.48.0/22 | 1k | APNIC |  PK | 3rd Aug 2016 |
| 182.255.60.0/22 | 1k | APNIC | CN | 3rd Aug 2016 |
| 182.49.0.0/16 | 65.5k | APNIC | CN | 22nd Feb 2010 |
| 182.50.176.0/21 | 2k | APNIC |  NO | 2nd Mar 2010 |
| 182.54.136.0/22 | 1k | APNIC |  TW | 26th Jul 2016 |
| 182.54.244.0/22 | 1k | APNIC | CN | 3rd Nov 2015 |
| 183.177.112.0/21 | 2k | APNIC |  PH | 1st Dec 2009 |
| 183.181.122.0/23 | 512 | APNIC |  JP | 1st Dec 2009 |
| 183.181.124.0/22 | 1k | APNIC | JP | 1st Dec 2009 |
| 183.181.130.0/23 | 512 | APNIC | JP | 1st Dec 2009 |
| 183.181.132.0/23 | 512 | APNIC | JP | 1st Dec 2009 |
| 183.181.138.0/23 | 512 | APNIC | JP | 1st Dec 2009 |
| 183.181.140.0/23 | 512 | APNIC | JP | 1st Dec 2009 |
| 183.183.0.0/16 | 65.5k | APNIC | JP | 7th Dec 2009 |
| 183.78.160.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 183.78.164.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 183.87.0.0/21 | 2k | APNIC | IN | 13th Nov 2009 |
| 183.87.16.0/20 | 4.1k | APNIC | IN | 13th Nov 2009 |
| 183.87.196.0/22 | 1k | APNIC | IN | 13th Nov 2009 |
| 183.87.8.0/22 | 1k | APNIC | IN | 13th Nov 2009 |
| 183.91.128.0/22 | 1k | APNIC | CN | 25th Nov 2009 |
| 183.91.136.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 184.128.0.0/12 | 1M | ARIN |  US | 25th Feb 2010 |
| 184.170.144.0/20 | 4.1k | ARIN | US | 18th May 2011 |
| 184.172.0.0/15 | 131k | ARIN | US | 6th Oct 2010 |
| 184.88.0.0/14 | 262k | ARIN | US | 31st Mar 2010 |
| 184.95.16.0/20 | 4.1k | ARIN | US | 14th Aug 2024 |
| 185.0.0.0/24 | 256 | RIPE NCC |  RO | 8th Sept 2022 |
| 185.0.10.0/24 | 256 | RIPE NCC |  NL | 29th Nov 2022 |
| 185.0.11.0/24 | 256 | RIPE NCC | NL | 13th Dec 2022 |
| 185.0.16.0/24 | 256 | RIPE NCC |  PL | 19th Dec 2022 |
| 185.0.17.0/24 | 256 | RIPE NCC |  DE | 11th Jan 2023 |
| 185.0.18.0/24 | 256 | RIPE NCC |  IT | 20th Jan 2023 |
| 185.0.19.0/24 | 256 | RIPE NCC |  FR | 8th May 2026 |