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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.11.109.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.11.117.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.118.0/24 | 256 | APNIC |  AU | 13th Jan 1995 |
| 203.11.119.0/24 | 256 | APNIC | AU | 13th Jan 1995 |
| 203.11.122.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.126.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.136.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.141.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.142.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.11.144.0/24 | 256 | APNIC | AU | 13th Jan 1995 |
| 203.11.168.0/21 | 2k | APNIC | AU | 15th Jan 1995 |
| 203.11.177.0/24 | 256 | APNIC | AU | 15th Jan 1995 |
| 203.11.178.0/23 | 512 | APNIC | AU | 15th Jan 1995 |
| 203.11.180.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.208.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.212.0/22 | 1k | APNIC | AU | 16th Jan 1995 |
| 203.11.64.0/24 | 256 | APNIC | AU | 23rd Dec 1994 |
| 203.11.65.0/24 | 256 | APNIC |  PK | 17th Aug 2016 |
| 203.11.70.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.76.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.82.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.11.84.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.11.96.0/24 | 256 | APNIC |  US | 12th Jan 1995 |
| 203.110.234.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.110.248.0/22 | 1k | APNIC | AU | 7th Nov 1996 |
| 203.110.252.0/22 | 1k | APNIC | AU | 22nd Mar 1996 |
| 203.111.254.0/23 | 512 | APNIC |  ID | 13th Oct 2023 |
| 203.112.128.0/22 | 1k | APNIC |  IN | 20th Jul 1999 |
| 203.114.80.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.114.84.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.114.88.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.114.92.0/22 | 1k | APNIC | CN | 24th Nov 2015 |
| 203.115.94.0/24 | 256 | APNIC | IN | 12th May 2003 |
| 203.118.192.0/19 | 8.2k | APNIC | CN | 27th May 2004 |
| 203.118.240.0/24 | 256 | APNIC |  SG | 23rd Oct 2008 |
| 203.118.241.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.118.243.0/24 | 256 | APNIC | AU | 28th Oct 2008 |
| 203.118.252.0/22 | 1k | APNIC |  JP | 28th Oct 2008 |
| 203.119.113.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.119.116.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.119.14.0/24 | 256 | APNIC | AU | 10th Feb 2004 |
| 203.119.21.0/24 | 256 | APNIC | AU | 18th Jan 2011 |
| 203.119.22.0/23 | 512 | APNIC | JP | 18th Jan 2011 |
| 203.119.41.0/24 | 256 | APNIC | ID | 1st Sept 2005 |
| 203.119.48.0/24 | 256 | APNIC | ID | 19th Oct 2005 |
| 203.119.49.0/24 | 256 | APNIC | IN | 27th Sept 2007 |
| 203.119.50.0/24 | 256 | APNIC | IN | 27th Sept 2007 |
| 203.119.58.0/23 | 512 | APNIC |  VN | 3rd Nov 2008 |
| 203.119.78.0/24 | 256 | APNIC | SG | 6th Oct 2009 |
| 203.119.85.0/24 | 256 | APNIC | CN | 5th Mar 2010 |