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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,493 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.3.139.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.3.142.0/24 | 256 | APNIC |  AU | 29th Mar 1994 |
| 203.3.143.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.3.152.0/22 | 1k | APNIC | AU | 14th Mar 1994 |
| 203.3.160.0/22 | 1k | APNIC | AU | 24th Mar 1994 |
| 203.3.68.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.3.72.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.3.75.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.3.78.0/24 | 256 | APNIC | AU | 4th Mar 1994 |
| 203.3.91.0/24 | 256 | APNIC |  ID | 13th Oct 2023 |
| 203.3.96.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.30.111.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.112.0/21 | 2k | APNIC | AU | 16th Aug 1996 |
| 203.30.121.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.123.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.135.0/24 | 256 | APNIC | AU | 19th Aug 1996 |
| 203.30.141.0/24 | 256 | APNIC | AU | 19th Aug 1996 |
| 203.30.152.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.156.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.16.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.30.161.0/24 | 256 | APNIC | AU | 20th Aug 1996 |
| 203.30.162.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.168.0/23 | 512 | APNIC |  SG | 24th Sept 2007 |
| 203.30.173.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.174.0/24 | 256 | APNIC |  NZ | 15th Oct 2007 |
| 203.30.175.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.179.0/24 | 256 | APNIC | AU | 28th Aug 1996 |
| 203.30.18.0/24 | 256 | APNIC | AU | 23rd Jul 1996 |
| 203.30.187.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.192.0/24 | 256 | APNIC | AU | 30th Aug 1996 |
| 203.30.194.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.195.0/24 | 256 | RIPE NCC |  JE | 11th Apr 2022 |
| 203.30.196.0/24 | 256 | APNIC | AU | 2nd Sept 1996 |
| 203.30.212.0/24 | 256 | APNIC | AU | 3rd Sept 1996 |
| 203.30.217.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.220.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.222.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.228.0/23 | 512 | APNIC | AU | 9th Sept 1996 |
| 203.30.231.0/24 | 256 | APNIC | AU | 10th Sept 1996 |
| 203.30.232.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.30.234.0/24 | 256 | APNIC | AU | 10th Sept 1996 |
| 203.30.235.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.239.0/24 | 256 | APNIC | AU | 16th Jun 2005 |
| 203.30.240.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.30.246.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.25.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.250.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.30.27.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.29.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.33.0/24 | 256 | RIPE NCC |  CY | 24th Jul 1996 |