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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.22.78.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.22.82.0/24 | 256 | APNIC |  AU | 18th Nov 1995 |
| 203.22.84.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.87.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.22.92.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.22.99.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.222.224.0/19 | 8.2k | APNIC |  JP | 26th Apr 2006 |
| 203.223.192.0/18 | 16.4k | APNIC |  HK | 14th Oct 2004 |
| 203.223.64.0/23 | 512 | APNIC | JP | 12th Apr 2001 |
| 203.223.66.0/23 | 512 | APNIC | JP | 13th Nov 2001 |
| 203.223.68.0/22 | 1k | APNIC | JP | 13th Nov 2001 |
| 203.223.72.0/21 | 2k | APNIC | JP | 13th Nov 2001 |
| 203.223.90.0/23 | 512 | APNIC |  ID | 27th Jun 2008 |
| 203.226.252.0/24 | 256 | APNIC |  KR | 23rd Apr 1996 |
| 203.23.0.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.100.0/24 | 256 | APNIC | AU | 17th Jan 1996 |
| 203.23.107.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.109.0/24 | 256 | APNIC | AU | 17th Jan 1996 |
| 203.23.111.0/24 | 256 | APNIC | AU | 17th Jan 1996 |
| 203.23.112.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.122.0/23 | 512 | APNIC | AU | 19th Jan 1996 |
| 203.23.125.0/24 | 256 | APNIC | AU | 22nd Jan 1996 |
| 203.23.129.0/24 | 256 | APNIC | AU | 13th Mar 1996 |
| 203.23.130.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.140.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.23.144.0/21 | 2k | APNIC | AU | 22nd Jan 1996 |
| 203.23.172.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.182.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.185.0/24 | 256 | APNIC | AU | 25th Jan 1996 |
| 203.23.186.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.23.192.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.195.0/24 | 256 | APNIC | AU | 31st Jan 1996 |
| 203.23.197.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.198.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.204.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.23.224.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.226.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.23.228.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.23.232.0/24 | 256 | APNIC | AU | 9th Feb 1996 |
| 203.23.233.0/24 | 256 | APNIC | AU | 19th Feb 1996 |
| 203.23.245.0/24 | 256 | APNIC | AU | 19th Feb 1996 |
| 203.23.249.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.251.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.4.0/24 | 256 | APNIC | AU | 21st Dec 1995 |
| 203.23.43.0/24 | 256 | APNIC | AU | 9th Jan 1996 |
| 203.23.45.0/24 | 256 | APNIC | AU | 9th Jan 1996 |
| 203.23.47.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.55.0/24 | 256 | APNIC | AU | 10th Jan 1996 |
| 203.23.61.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.23.62.0/23 | 512 | APNIC | CN | 14th Apr 2011 |