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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 203.24.210.0/24 | 256 | APNIC |  AU | 27th Feb 1996 |
| 203.24.212.0/23 | 512 | APNIC |  CN | 14th Apr 2011 |
| 203.24.217.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.219.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.242.0/23 | 512 | APNIC | AU | 29th Feb 1996 |
| 203.24.244.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.27.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.28.0/22 | 1k | APNIC |  SG | 20th Feb 1996 |
| 203.24.41.0/24 | 256 | APNIC | AU | 20th Feb 1996 |
| 203.24.43.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.55.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.24.56.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.58.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.59.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.24.67.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.68.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.24.74.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.79.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.80.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.24.84.0/23 | 512 | APNIC | CN | 14th Apr 2011 |
| 203.24.86.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.90.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.24.96.0/24 | 256 | APNIC | AU | 21st Feb 1996 |
| 203.240.0.0/18 | 16.4k | APNIC |  KR | 29th Sept 1996 |
| 203.240.100.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.240.104.0/21 | 2k | APNIC | KR | 29th Sept 1996 |
| 203.240.112.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.240.160.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.240.176.0/21 | 2k | APNIC | KR | 29th Sept 1996 |
| 203.240.184.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.240.188.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.240.190.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.240.98.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.241.136.0/21 | 2k | APNIC | KR | 29th Sept 1996 |
| 203.241.166.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.241.175.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.241.216.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.241.48.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.241.80.0/22 | 1k | APNIC | KR | 29th Sept 1996 |
| 203.242.112.0/21 | 2k | APNIC | KR | 29th Sept 1996 |
| 203.242.63.0/24 | 256 | APNIC | KR | 29th Sept 1996 |
| 203.242.96.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.243.64.0/18 | 16.4k | APNIC | KR | 29th Sept 1996 |
| 203.244.224.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.244.240.0/20 | 4.1k | APNIC | KR | 29th Sept 1996 |
| 203.246.190.0/23 | 512 | APNIC | KR | 29th Sept 1996 |
| 203.249.192.0/19 | 8.2k | APNIC | KR | 29th Sept 1996 |
| 203.25.100.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.25.106.0/24 | 256 | APNIC | CN | 14th Apr 2011 |
| 203.25.131.0/24 | 256 | APNIC | CN | 14th Apr 2011 |