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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 122.145.39.0/24 | 256 | APNIC |  JP | 5th Jan 2007 |
| 122.152.96.0/19 | 8.2k | APNIC |  KR | 30th Dec 2010 |
| 122.198.0.0/18 | 16.4k | APNIC |  CN | 27th Jul 2006 |
| 122.198.128.0/17 | 32.8k | APNIC | CN | 27th Jul 2006 |
| 122.198.64.0/22 | 1k | APNIC | CN | 27th Jul 2006 |
| 122.198.68.0/22 | 1k | APNIC | CN | 27th Jul 2006 |
| 122.198.72.0/21 | 2k | APNIC | CN | 27th Jul 2006 |
| 122.198.80.0/20 | 4.1k | APNIC | CN | 27th Jul 2006 |
| 122.198.96.0/19 | 8.2k | APNIC | CN | 27th Jul 2006 |
| 122.200.128.0/22 | 1k | APNIC | JP | 30th Mar 2011 |
| 122.201.48.0/20 | 4.1k | APNIC | CN | 21st Jan 2011 |
| 122.222.128.0/20 | 4.1k | ARIN |  US | 26th Jun 2024 |
| 122.223.0.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 122.223.144.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 122.223.80.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 122.223.96.0/20 | 4.1k | ARIN | US | 26th Jun 2024 |
| 122.248.0.0/20 | 4.1k | APNIC |  BD | 17th Nov 2006 |
| 122.248.24.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 122.252.160.0/20 | 4.1k | APNIC |  TW | 15th Nov 2006 |
| 122.252.184.0/21 | 2k | APNIC |  NZ | 21st Jan 2011 |
| 122.255.64.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 122.8.192.0/18 | 16.4k | APNIC | CN | 14th Aug 2006 |
| 122.99.104.0/21 | 2k | APNIC | JP | 16th Oct 2007 |
| 123.0.0.0/20 | 4.1k | APNIC | KR | 27th Dec 2006 |
| 123.0.128.0/18 | 16.4k | APNIC | CN | 3rd Nov 2006 |
| 123.100.0.0/19 | 8.2k | APNIC | CN | 11th Jan 2007 |
| 123.100.234.0/24 | 256 | RIPE NCC |  GB | 10th Nov 2006 |
| 123.100.235.0/24 | 256 | APNIC |  SG | 10th Nov 2006 |
| 123.102.0.0/16 | 65.5k | APNIC |  AU | 5th Dec 2006 |
| 123.108.0.0/21 | 2k | APNIC | KR | 31st Jan 2007 |
| 123.108.104.0/22 | 1k | APNIC | AU | 23rd Dec 2008 |
| 123.108.8.0/21 | 2k | APNIC |  ID | 31st Jan 2007 |
| 123.137.0.0/16 | 65.5k | APNIC | CN | 28th Feb 2007 |
| 123.176.59.0/24 | 256 | APNIC | BD | 19th Nov 2009 |
| 123.176.60.0/22 | 1k | APNIC | CN | 6th Jan 2011 |
| 123.176.80.0/20 | 4.1k | APNIC | CN | 20th Mar 2007 |
| 123.199.128.0/17 | 32.8k | APNIC | CN | 16th Jun 2006 |
| 123.236.0.0/14 | 262k | APNIC |  IN | 16th Feb 2007 |
| 123.242.0.0/17 | 32.8k | APNIC | CN | 12th Feb 2007 |
| 123.249.128.0/17 | 32.8k | APNIC | CN | 30th Jan 2007 |
| 123.250.0.0/15 | 131k | APNIC | KR | 29th Jan 2007 |
| 123.253.142.0/24 | 256 | APNIC | NZ | 14th May 2019 |
| 123.253.16.0/22 | 1k | APNIC | JP | 13th May 2019 |
| 123.253.168.0/22 | 1k | APNIC |  HK | 12th Jun 2019 |
| 123.253.182.0/23 | 512 | APNIC | IN | 15th Sept 2025 |
| 123.253.204.0/22 | 1k | APNIC | IN | 13th Jun 2019 |
| 123.253.244.0/22 | 1k | APNIC | ID | 27th Jun 2019 |
| 123.253.252.0/22 | 1k | APNIC | ID | 27th Jun 2019 |
| 123.253.52.0/23 | 512 | APNIC | CN | 29th Sept 2025 |
| 123.253.80.0/22 | 1k | APNIC | SG | 13th May 2019 |