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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.14.68.0/24 | 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 |
| 203.147.160.0/19 | 8.2k | APNIC | SG | 24th Sept 1999 |
| 203.147.192.0/19 | 8.2k | APNIC | SG | 22nd Jan 1999 |
| 203.147.224.0/19 | 8.2k | APNIC | SG | 31st Jul 1998 |
| 203.148.80.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.148.94.0/23 | 512 | APNIC | AU | 4th Nov 2008 |
| 203.149.240.0/20 | 4.1k | APNIC | SG | 22nd Dec 1999 |
| 203.149.92.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.15.104.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.15.105.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.15.106.0/24 | 256 | APNIC | AU | 13th May 1995 |
| 203.15.129.0/24 | 256 | APNIC | AU | 15th May 1995 |
| 203.15.130.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.15.139.0/24 | 256 | APNIC | AU | 16th May 1995 |
| 203.15.149.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.15.151.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.15.154.0/24 | 256 | APNIC | AU | 4th Dec 2008 |
| 203.15.156.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.15.174.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.15.176.0/20 | 4.1k | APNIC | AU | 19th May 1995 |
| 203.15.192.0/19 | 8.2k | APNIC | AU | 19th May 1995 |
| 203.15.20.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.15.22.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.15.227.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.15.228.0/22 | 1k | APNIC | AU | 21st May 1995 |
| 203.15.232.0/21 | 2k | APNIC | CN | 14th Apr 2011 |
| 203.15.240.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.15.246.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.15.247.0/24 | 256 | APNIC | AU | 31st May 1995 |