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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,536 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.21.8.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.21.82.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.21.96.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.210.80.0/23 | 512 | APNIC |  IN | 13th May 2019 |
| 203.211.56.0/22 | 1k | APNIC |  PH | 25th Sept 2017 |
| 203.211.60.0/22 | 1k | APNIC |  SG | 20th Jun 2008 |
| 203.212.160.0/19 | 8.2k | APNIC |  KR | 7th Feb 2006 |
| 203.212.65.0/24 | 256 | APNIC | IN | 29th Nov 2000 |
| 203.217.134.0/23 | 512 | APNIC |  ID | 23rd Jun 2009 |
| 203.217.137.0/24 | 256 | APNIC |  US | 23rd Jun 2009 |
| 203.217.141.0/24 | 256 | APNIC |  AU | 30th Jun 2009 |
| 203.217.162.0/23 | 512 | APNIC | AU | 7th Mar 2016 |
| 203.217.164.0/22 | 1k | APNIC | CN | 10th Dec 2015 |
| 203.217.174.0/24 | 256 | APNIC | IN | 10th Jul 2009 |
| 203.217.192.0/21 | 2k | APNIC | KR | 9th Aug 2006 |
| 203.217.200.0/22 | 1k | APNIC | KR | 9th Aug 2006 |
| 203.22.106.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.107.0/24 | 256 | APNIC | AU | 23rd Nov 1995 |
| 203.22.112.0/22 | 1k | APNIC | AU | 23rd Nov 1995 |
| 203.22.122.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.22.128.0/24 | 256 | APNIC | AU | 28th Nov 1995 |
| 203.22.129.0/24 | 256 | APNIC | AU | 1st Dec 1995 |
| 203.22.130.0/24 | 256 | APNIC | AU | 1st Dec 1995 |
| 203.22.131.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.136.0/21 | 2k | APNIC | AU | 1st Dec 1995 |
| 203.22.16.0/23 | 512 | APNIC | AU | 14th Nov 1995 |
| 203.22.163.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.164.0/23 | 512 | APNIC | AU | 4th Dec 1995 |
| 203.22.166.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.170.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.176.0/21 | 2k | APNIC | CN | 14th Apr 2011 |
| 203.22.194.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.20.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.22.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.220.0/23 | 512 | APNIC | AU | 5th Dec 1995 |
| 203.22.222.0/24 | 256 | APNIC | AU | 16th May 2007 |
| 203.22.229.0/24 | 256 | APNIC | AU | 11th Dec 1995 |
| 203.22.23.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.236.0/22 | 1k | APNIC | AU | 14th Dec 1995 |
| 203.22.24.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.242.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.22.245.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.246.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.25.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.252.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.22.28.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.22.31.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.65.0/24 | 256 | APNIC | AU | 17th Nov 1995 |
| 203.22.68.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.76.0/24 | 256 | APNIC | CN | 14th Apr 2011 |