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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks registered through APNIC
22,624 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 203.0.114.0/23 | 512 | APNIC |  CN | 14th Apr 2011 |
| 203.0.121.0/24 | 256 | APNIC |  AU | 21st Sept 1993 |
| 203.0.122.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.123.0/24 | 256 | APNIC | AU | 22nd Sept 1993 |
| 203.0.128.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.130.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.0.132.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.0.137.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.138.0/24 | 256 | APNIC | AU | 27th Sept 1993 |
| 203.0.142.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.144.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.146.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.148.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.150.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.0.152.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.153.0/24 | 256 | APNIC | AU | 25th Nov 1993 |
| 203.0.177.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.18.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.224.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.24.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.25.0/24 | 256 | APNIC | AU | 6th Sept 1993 |
| 203.0.32.0/22 | 1k | APNIC | AU | 7th Sept 1993 |
| 203.0.4.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.0.41.0/24 | 256 | APNIC | AU | 7th Sept 1993 |
| 203.0.42.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.0.45.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.46.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.0.48.0/20 | 4.1k | APNIC | AU | 8th Sept 1993 |
| 203.0.68.0/22 | 1k | APNIC | AU | 14th Sept 1993 |
| 203.0.81.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.0.82.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.0.84.0/22 | 1k | APNIC | AU | 17th Sept 1993 |
| 203.0.90.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.0.92.0/22 | 1k | APNIC | AU | 17th Sept 1993 |
| 203.0.96.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.100.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 203.1.108.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.128.0/18 | 16.4k | APNIC | AU | 5th Nov 1993 |
| 203.1.18.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.222.0/24 | 256 | APNIC | AU | 24th Feb 2010 |
| 203.1.223.0/24 | 256 | APNIC | AU | 24th Feb 2010 |
| 203.1.24.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.1.248.0/22 | 1k | APNIC | AU | 13th Dec 1993 |
| 203.1.25.0/24 | 256 | APNIC |  ID | 11th Feb 2011 |
| 203.1.253.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.254.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.1.26.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.1.29.0/24 | 256 | APNIC | AU | 13th Oct 1993 |
| 203.1.3.0/24 | 256 | APNIC | AU | 29th Nov 1993 |
| 203.1.30.0/24 | 256 | APNIC | AU | 13th Oct 1993 |