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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 123.255.208.0/21 | 2k | APNIC |  AU | 19th Nov 2008 |
| 123.255.216.0/21 | 2k | APNIC | AU | 18th Mar 2009 |
| 123.255.252.0/22 | 1k | APNIC |  IN | 9th Dec 2008 |
| 123.255.80.0/21 | 2k | APNIC |  HK | 15th Jun 2009 |
| 123.49.64.0/19 | 8.2k | APNIC |  SG | 8th Jun 2006 |
| 123.49.96.0/19 | 8.2k | APNIC | SG | 14th Feb 2007 |
| 123.50.160.0/19 | 8.2k | APNIC |  CN | 12th Apr 2011 |
| 123.61.0.0/16 | 65.5k | APNIC | CN | 16th Jan 2007 |
| 123.62.0.0/16 | 65.5k | APNIC | CN | 16th Jan 2007 |
| 123.98.128.0/20 | 4.1k | APNIC | AU | 23rd Nov 2006 |
| 123.99.0.0/19 | 8.2k | APNIC |  TW | 28th Sept 2006 |
| 123.99.32.0/19 | 8.2k | APNIC | TW | 25th Jan 2007 |
| 124.108.0.0/22 | 1k | APNIC | AU | 31st Dec 2010 |
| 124.108.112.0/20 | 4.1k | APNIC | SG | 20th Jun 2007 |
| 124.108.40.0/21 | 2k | APNIC | CN | 23rd Jun 2006 |
| 124.108.8.0/21 | 2k | APNIC | CN | 6th Mar 2006 |
| 124.108.96.0/20 | 4.1k | APNIC | HK | 15th Feb 2006 |
| 124.109.96.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 124.110.112.0/20 | 4.1k | ARIN |  US | 26th Jun 2024 |
| 124.14.24.0/21 | 2k | APNIC | CN | 10th Jan 2007 |
| 124.14.32.0/20 | 4.1k | APNIC | CN | 10th Jan 2007 |
| 124.14.48.0/22 | 1k | APNIC | CN | 10th Jan 2007 |
| 124.14.52.0/22 | 1k | APNIC | CN | 10th Jan 2007 |
| 124.14.56.0/21 | 2k | APNIC | CN | 10th Jan 2007 |
| 124.147.128.0/17 | 32.8k | APNIC | CN | 6th Mar 2006 |
| 124.147.32.0/19 | 8.2k | APNIC |  JP | 15th Mar 2006 |
| 124.15.0.0/16 | 65.5k | APNIC | CN | 10th Jan 2007 |
| 124.150.136.0/24 | 256 | APNIC | IN | 23rd Feb 2018 |
| 124.150.137.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 124.150.138.0/24 | 256 | APNIC | AU | 7th Mar 2016 |
| 124.157.0.0/18 | 16.4k | APNIC |  VN | 30th Mar 2011 |
| 124.157.128.0/17 | 32.8k | APNIC |  TH | 31st Mar 2006 |
| 124.158.24.0/22 | 1k | APNIC | AU | 8th Feb 2010 |
| 124.158.28.0/22 | 1k | APNIC | IN | 10th Feb 2010 |
| 124.158.64.0/19 | 8.2k | APNIC | SG | 3rd Oct 2007 |
| 124.19.128.0/17 | 32.8k | APNIC |  PH | 5th Oct 2007 |
| 124.197.56.0/21 | 2k | APNIC | CN | 12th Apr 2006 |
| 124.198.192.0/19 | 8.2k | RIPE NCC |  DE | 22nd Mar 2010 |
| 124.20.0.0/16 | 65.5k | APNIC | CN | 30th Dec 2005 |
| 124.21.128.0/17 | 32.8k | APNIC | CN | 1st Mar 2006 |
| 124.21.32.0/19 | 8.2k | APNIC | CN | 1st Mar 2006 |
| 124.21.64.0/18 | 16.4k | APNIC | CN | 1st Mar 2006 |
| 124.217.192.0/19 | 8.2k | APNIC |  KR | 2nd Nov 2007 |
| 124.242.0.0/16 | 65.5k | APNIC | CN | 2nd May 2006 |
| 124.249.0.0/16 | 65.5k | APNIC | CN | 23rd May 2006 |
| 124.26.0.0/15 | 131k | APNIC | JP | 14th Mar 2006 |
| 124.40.112.0/20 | 4.1k | APNIC | CN | 24th Sept 2007 |
| 124.40.192.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 124.40.240.0/22 | 1k | APNIC | CN | 29th Oct 2015 |
| 124.42.128.0/17 | 32.8k | APNIC | CN | 18th Oct 2007 |