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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.14.104.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.14.111.0/24 | 256 | APNIC |  AU | 20th Apr 1995 |
| 203.14.114.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.14.118.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.124.0/23 | 512 | APNIC | AU | 28th Apr 1995 |
| 203.14.126.0/24 | 256 | APNIC | AU | 28th Apr 1995 |
| 203.14.127.0/24 | 256 | APNIC | AU | 28th Apr 1995 |
| 203.14.144.0/21 | 2k | APNIC | AU | 28th Apr 1995 |
| 203.14.162.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.166.0/24 | 256 | APNIC |  CH | 28th Apr 1995 |
| 203.14.192.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.194.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.14.197.0/24 | 256 | APNIC | AU | 28th Apr 1995 |
| 203.14.20.0/24 | 256 | APNIC |  NZ | 30th Mar 1995 |
| 203.14.210.0/23 | 512 | APNIC | AU | 3rd May 1995 |
| 203.14.212.0/24 | 256 | APNIC |  JP | 20th Jul 2005 |
| 203.14.214.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.224.0/22 | 1k | APNIC | AU | 8th May 1995 |
| 203.14.231.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.232.0/21 | 2k | APNIC | AU | 10th May 1995 |
| 203.14.24.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.14.246.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.33.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.35.0/24 | 256 | APNIC | AU | 10th Apr 1995 |
| 203.14.56.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.60.0/24 | 256 | APNIC | AU | 16th Apr 1995 |
| 203.14.61.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.62.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.14.68.0/24 | 256 | APNIC | AU | 6th Apr 1995 |
| 203.14.96.0/22 | 1k | APNIC | AU | 16th Apr 1995 |
| 203.142.0.0/22 | 1k | APNIC |  MY | 12th May 2004 |
| 203.142.11.0/24 | 256 | APNIC |  US | 12th May 2004 |
| 203.142.218.0/24 | 256 | APNIC |  PK | 17th Aug 2016 |
| 203.142.219.0/24 | 256 | APNIC | CN | 9th Jun 2016 |
| 203.142.224.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 203.142.28.0/22 | 1k | APNIC |  SG | 12th May 2004 |
| 203.143.128.0/19 | 8.2k | APNIC | SG | 27th Jul 2000 |
| 203.143.91.0/24 | 256 | APNIC | AU | 19th Jul 2000 |
| 203.145.0.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 203.146.118.0/23 | 512 | APNIC |  TH | 14th Jul 1999 |
| 203.146.202.0/24 | 256 | APNIC | TH | 7th Mar 2000 |
| 203.146.227.0/24 | 256 | APNIC | TH | 23rd Nov 2000 |
| 203.146.24.0/24 | 256 | APNIC | TH | 19th Mar 1997 |
| 203.146.243.0/24 | 256 | APNIC | TH | 23rd Nov 2000 |
| 203.146.45.0/24 | 256 | APNIC | TH | 17th Jul 1997 |
| 203.146.74.0/24 | 256 | APNIC | TH | 3rd Dec 1998 |
| 203.146.99.0/24 | 256 | APNIC | TH | 14th Jul 1999 |
| 203.147.108.0/23 | 512 | APNIC | AU | 26th Mar 2008 |
| 203.147.110.0/23 | 512 | APNIC |  HK | 24th Jun 2011 |
| 203.147.144.0/20 | 4.1k | ARIN | US | 22nd May 2024 |