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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,536 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.119.90.0/23 | 512 | APNIC |  NP | 24th Mar 2010 |
| 203.119.94.0/24 | 256 | APNIC |  TW | 2nd Sept 2010 |
| 203.12.100.0/23 | 512 | APNIC |  CN | 14th Apr 2011 |
| 203.12.103.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.114.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.118.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.119.0/24 | 256 | APNIC |  AU | 9th Feb 1995 |
| 203.12.122.0/23 | 512 | APNIC | AU | 13th Feb 1995 |
| 203.12.128.0/24 | 256 | APNIC | AU | 13th Feb 1995 |
| 203.12.130.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.137.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.16.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.19.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.192.0/24 | 256 | APNIC | AU | 16th Feb 1995 |
| 203.12.193.0/24 | 256 | APNIC | AU | 16th Feb 1995 |
| 203.12.196.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.12.211.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.212.0/22 | 1k | APNIC | AU | 16th Apr 2010 |
| 203.12.216.0/23 | 512 | APNIC | AU | 19th Sept 2010 |
| 203.12.218.0/24 | 256 | RIPE NCC |  GB | 16th Feb 1995 |
| 203.12.219.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.222.0/23 | 512 | APNIC |  IN | 11th Jul 2006 |
| 203.12.226.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.24.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.240.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.12.250.0/24 | 256 | APNIC | AU | 23rd Feb 1995 |
| 203.12.38.0/24 | 256 | APNIC | AU | 23rd Jan 1995 |
| 203.12.42.0/24 | 256 | APNIC | AU | 23rd Jan 1995 |
| 203.12.57.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.65.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.66.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.67.0/24 | 256 | APNIC | AU | 2nd Feb 1995 |
| 203.12.70.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.12.72.0/21 | 2k | APNIC | AU | 1st Feb 1995 |
| 203.12.82.0/24 | 256 | APNIC | AU | 2nd Feb 1995 |
| 203.12.87.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.12.99.0/24 | 256 | APNIC | AU | 8th Feb 1995 |
| 203.120.1.0/24 | 256 | APNIC |  JP | 19th May 1995 |
| 203.120.108.0/23 | 512 | APNIC | JP | 19th Oct 1995 |
| 203.120.111.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.120.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.122.0/23 | 512 | APNIC | JP | 19th Oct 1995 |
| 203.120.125.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.127.0/24 | 256 | APNIC | JP | 19th Oct 1995 |
| 203.120.130.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.136.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.138.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.146.0/23 | 512 | APNIC | JP | 11th Feb 1996 |
| 203.120.148.0/24 | 256 | APNIC | JP | 11th Feb 1996 |
| 203.120.154.0/23 | 512 | APNIC | JP | 11th Feb 1996 |