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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.30.48.0/23 | 512 | APNIC |  SG | 1st Sept 2005 |
| 203.30.59.0/24 | 256 | APNIC |  AU | 5th Aug 1996 |
| 203.30.66.0/24 | 256 | APNIC |  CN | 14th Apr 2011 |
| 203.30.81.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.30.82.0/23 | 512 | APNIC | AU | 6th Aug 1996 |
| 203.30.85.0/24 | 256 | APNIC | AU | 6th Aug 1996 |
| 203.30.87.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.105.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.106.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.108.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.31.12.0/24 | 256 | APNIC | AU | 13th Sept 1996 |
| 203.31.121.0/24 | 256 | APNIC | AU | 19th Sept 1996 |
| 203.31.122.0/23 | 512 | APNIC | AU | 19th Sept 1996 |
| 203.31.124.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.161.0/24 | 256 | APNIC |  NZ | 19th Sept 1996 |
| 203.31.162.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.168.0/24 | 256 | APNIC | AU | 19th Sept 1996 |
| 203.31.170.0/24 | 256 | APNIC | AU | 19th Sept 1996 |
| 203.31.174.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.177.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.181.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.187.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.189.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.190.0/24 | 256 | APNIC | AU | 25th Sept 1996 |
| 203.31.204.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.205.0/24 | 256 | APNIC | AU | 25th Sept 1996 |
| 203.31.206.0/23 | 512 | APNIC | AU | 25th Sept 1996 |
| 203.31.220.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.222.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.31.225.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.229.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.230.0/23 | 512 | APNIC | AU | 9th Oct 2007 |
| 203.31.232.0/23 | 512 | APNIC | AU | 25th Sept 1996 |
| 203.31.238.0/23 | 512 | APNIC | AU | 25th Sept 1996 |
| 203.31.24.0/23 | 512 | APNIC | AU | 13th Sept 1996 |
| 203.31.244.0/23 | 512 | ARIN |  US | 18th Nov 2024 |
| 203.31.246.0/24 | 256 | APNIC | AU | 25th Sept 1996 |
| 203.31.248.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.31.253.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.4.0/23 | 512 | APNIC | AU | 13th Sept 1996 |
| 203.31.45.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.46.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.47.0/24 | 256 | APNIC | AU | 16th Sept 1996 |
| 203.31.49.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.51.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.31.54.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.31.59.0/24 | 256 | APNIC | AU | 16th Sept 1996 |
| 203.31.61.0/24 | 256 | APNIC | AU | 16th Sept 1996 |
| 203.31.66.0/24 | 256 | APNIC | AU | 17th Sept 1996 |
| 203.31.69.0/24 | 256 | APNIC | CN | 14th Apr 2011 |