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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,578 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.19.96.0/22 | 1k | APNIC |  AU | 31st Aug 1995 |
| 203.190.120.0/24 | 256 | APNIC |  HK | 16th Jan 2007 |
| 203.190.123.0/24 | 256 | APNIC | HK | 16th Jan 2007 |
| 203.190.124.0/22 | 1k | APNIC | HK | 16th Jan 2007 |
| 203.190.176.0/21 | 2k | APNIC |  SG | 16th May 2006 |
| 203.190.184.0/21 | 2k | APNIC |  ID | 17th May 2006 |
| 203.190.249.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.190.28.0/22 | 1k | APNIC |  JP | 19th May 2008 |
| 203.191.132.0/24 | 256 | APNIC | AU | 8th Sept 2010 |
| 203.191.133.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.191.152.0/21 | 2k | APNIC | CN | 14th Sept 2006 |
| 203.191.16.0/20 | 4.1k | APNIC | CN | 19th May 2006 |
| 203.191.2.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.191.3.0/24 | 256 | APNIC | HK | 6th Jul 2006 |
| 203.191.36.0/22 | 1k | ARIN |  US | 11th Dec 2023 |
| 203.191.40.0/22 | 1k | APNIC | ID | 9th Sept 2005 |
| 203.191.46.0/24 | 256 | APNIC | ID | 9th Sept 2005 |
| 203.191.47.0/24 | 256 | APNIC | ID | 9th Sept 2005 |
| 203.191.5.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.191.56.0/22 | 1k | APNIC |  IN | 13th Nov 2015 |
| 203.191.64.0/18 | 16.4k | APNIC | CN | 26th Jul 2004 |
| 203.191.7.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.195.0.0/18 | 16.4k | APNIC |  VN | 11th Apr 2011 |
| 203.195.124.0/24 | 256 | APNIC |  NZ | 4th Jun 2008 |
| 203.195.125.0/24 | 256 | APNIC | SG | 5th Jun 2008 |
| 203.195.126.0/24 | 256 | APNIC | AU | 11th Aug 2026 |
| 203.196.28.0/22 | 1k | APNIC | CN | 13th Nov 2015 |
| 203.196.88.0/23 | 512 | APNIC | JP | 10th Jun 2008 |
| 203.196.91.0/24 | 256 | APNIC | JP | 16th Jun 2008 |
| 203.2.126.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.2.128.0/23 | 512 | APNIC | AU | 6th Jan 1994 |
| 203.2.132.0/24 | 256 | APNIC | AU | 31st Mar 2011 |
| 203.2.135.0/24 | 256 | APNIC | AU | 14th Jan 1994 |
| 203.2.140.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.2.144.0/24 | 256 | APNIC |  MY | 27th Sept 1995 |
| 203.2.146.0/23 | 512 | APNIC | AU | 21st Jan 1994 |
| 203.2.150.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.2.152.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.2.156.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.2.180.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.2.196.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.2.209.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.2.210.0/24 | 256 | APNIC | AU | 15th Aug 1995 |
| 203.2.212.0/23 | 512 | APNIC | AU | 11th Feb 1994 |
| 203.2.214.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.2.219.0/24 | 256 | APNIC | AU | 11th Feb 1994 |
| 203.2.226.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.2.229.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.2.230.0/24 | 256 | APNIC | AU | 25th Feb 1994 |
| 203.2.232.0/22 | 1k | APNIC | AU | 25th Feb 1994 |