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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks registered through APNIC
22,624 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.175.16.0/20 | 4.1k | APNIC |  JP | 27th Apr 2006 |
| 203.175.177.0/24 | 256 | APNIC |  IN | 31st Dec 2008 |
| 203.175.192.0/18 | 16.4k | APNIC |  CN | 28th Nov 2002 |
| 203.176.0.0/18 | 16.4k | APNIC | CN | 6th Apr 2011 |
| 203.176.144.0/21 | 2k | APNIC |  MY | 19th Sept 2006 |
| 203.176.160.0/21 | 2k | APNIC |  VN | 1st Dec 2006 |
| 203.176.189.0/24 | 256 | APNIC |  AU | 24th Apr 2008 |
| 203.18.100.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.18.105.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.106.0/24 | 256 | APNIC | AU | 10th Aug 1995 |
| 203.18.107.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.110.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.129.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.131.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.132.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.18.14.0/23 | 512 | APNIC | AU | 16th Apr 2007 |
| 203.18.144.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.153.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.154.0/24 | 256 | APNIC | AU | 15th Aug 1995 |
| 203.18.155.0/24 | 256 | APNIC | AU | 16th Aug 1995 |
| 203.18.156.0/23 | 512 | APNIC |  TW | 31st Jul 2025 |
| 203.18.160.0/24 | 256 | APNIC | AU | 16th Aug 1995 |
| 203.18.164.0/22 | 1k | APNIC | AU | 16th Aug 1995 |
| 203.18.186.0/23 | 512 | APNIC | AU | 16th Aug 1995 |
| 203.18.188.0/22 | 1k | APNIC | AU | 16th Apr 2010 |
| 203.18.19.0/24 | 256 | APNIC | AU | 2nd Aug 1995 |
| 203.18.196.0/24 | 256 | APNIC | AU | 17th Aug 1995 |
| 203.18.199.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.2.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.18.204.0/22 | 1k | APNIC | AU | 17th Aug 1995 |
| 203.18.208.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.209.0/24 | 256 | APNIC | AU | 17th Aug 1995 |
| 203.18.211.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.215.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.22.0/24 | 256 | APNIC | AU | 2nd Aug 1995 |
| 203.18.224.0/22 | 1k | APNIC | AU | 18th Aug 1995 |
| 203.18.231.0/24 | 256 | APNIC | AU | 18th Aug 1995 |
| 203.18.236.0/22 | 1k | APNIC | AU | 18th Aug 1995 |
| 203.18.244.0/24 | 256 | APNIC | AU | 18th Aug 1995 |
| 203.18.28.0/24 | 256 | APNIC | AU | 2nd Aug 1995 |
| 203.18.31.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.32.0/24 | 256 | APNIC | AU | 2nd Aug 1995 |
| 203.18.37.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.4.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.48.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.18.52.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.58.0/24 | 256 | APNIC | AU | 4th Aug 1995 |
| 203.18.64.0/21 | 2k | APNIC | AU | 4th Aug 1995 |
| 203.18.7.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.18.72.0/22 | 1k | APNIC | CN | 14th Apr 2011 |