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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 220.232.210.0/24 | 256 | APNIC |  HK | 19th Nov 2004 |
| 220.232.254.0/24 | 256 | APNIC |  JP | 19th Nov 2004 |
| 220.247.144.0/20 | 4.1k | APNIC |  AU | 30th Mar 2011 |
| 220.252.0.0/16 | 65.5k | APNIC |  CN | 28th Feb 2003 |
| 220.32.0.0/14 | 262k | APNIC | JP | 12th Apr 2002 |
| 220.38.0.0/18 | 16.4k | APNIC | JP | 12th Apr 2002 |
| 220.38.104.0/21 | 2k | APNIC | JP | 12th Apr 2002 |
| 220.38.112.0/20 | 4.1k | APNIC | JP | 12th Apr 2002 |
| 220.38.128.0/17 | 32.8k | APNIC | JP | 12th Apr 2002 |
| 220.38.64.0/19 | 8.2k | APNIC | JP | 12th Apr 2002 |
| 220.38.96.0/21 | 2k | APNIC | JP | 12th Apr 2002 |
| 220.39.0.0/19 | 8.2k | APNIC | JP | 12th Apr 2002 |
| 220.39.128.0/17 | 32.8k | APNIC | JP | 12th Apr 2002 |
| 220.39.32.0/21 | 2k | APNIC | JP | 12th Apr 2002 |
| 220.39.40.0/23 | 512 | APNIC | JP | 12th Apr 2002 |
| 220.39.42.0/23 | 512 | APNIC | JP | 12th Apr 2002 |
| 220.39.44.0/22 | 1k | APNIC | JP | 12th Apr 2002 |
| 220.39.48.0/20 | 4.1k | APNIC | JP | 12th Apr 2002 |
| 220.39.64.0/18 | 16.4k | APNIC | JP | 12th Apr 2002 |
| 220.40.0.0/15 | 131k | APNIC | JP | 12th Apr 2002 |
| 220.44.0.0/14 | 262k | APNIC | JP | 12th Apr 2002 |
| 221.121.176.0/21 | 2k | APNIC | JP | 31st Jul 2006 |
| 221.128.0.0/18 | 16.4k | APNIC | JP | 19th Aug 2003 |
| 221.128.104.0/22 | 1k | APNIC | JP | 8th Oct 2003 |
| 221.128.108.0/23 | 512 | APNIC | JP | 8th Oct 2003 |
| 221.128.110.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.115.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.116.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.118.0/23 | 512 | APNIC | JP | 8th Oct 2003 |
| 221.128.121.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.123.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.71.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.73.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.77.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.79.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.81.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.87.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.88.0/22 | 1k | APNIC | JP | 8th Oct 2003 |
| 221.128.97.0/24 | 256 | APNIC | JP | 8th Oct 2003 |
| 221.128.98.0/23 | 512 | APNIC | JP | 8th Oct 2003 |
| 221.132.120.0/21 | 2k | APNIC | JP | 30th Dec 2010 |
| 221.132.192.0/18 | 16.4k | APNIC |  ID | 16th Feb 2005 |
| 221.136.0.0/16 | 65.5k | APNIC | CN | 7th Jul 2003 |
| 221.46.0.0/15 | 131k | APNIC | JP | 15th Jan 2003 |
| 222.123.0.0/16 | 65.5k | APNIC |  TH | 6th Sept 2006 |
| 222.158.64.0/18 | 16.4k | APNIC | JP | 2nd Jun 2004 |
| 222.167.48.0/20 | 4.1k | APNIC | HK | 19th Nov 2004 |
| 223.130.0.0/22 | 1k | APNIC |  SG | 8th Dec 2010 |
| 223.130.240.0/20 | 4.1k | APNIC |  KR | 29th Jul 2010 |
| 223.164.0.0/16 | 65.5k | APNIC | ID | 16th Jul 2010 |