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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.36.184.0/22 | 1k | APNIC |  CN | 17th Aug 2014 |
| 103.36.188.0/22 | 1k | APNIC | CN | 17th Aug 2014 |
| 103.36.212.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.216.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.224.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.228.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.232.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.236.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.24.0/23 | 512 | APNIC |  TW | 8th Nov 2022 |
| 103.36.240.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.244.0/22 | 1k | APNIC | CN | 18th Aug 2014 |
| 103.36.40.0/22 | 1k | APNIC |  ID | 12th Aug 2014 |
| 103.36.52.0/23 | 512 | APNIC | ID | 9th Nov 2022 |
| 103.36.56.0/22 | 1k | APNIC | CN | 13th Aug 2014 |
| 103.36.64.0/22 | 1k | APNIC | CN | 13th Aug 2014 |
| 103.36.72.0/22 | 1k | APNIC | CN | 13th Aug 2014 |
| 103.37.104.0/22 | 1k | APNIC | CN | 25th Aug 2014 |
| 103.37.168.0/22 | 1k | APNIC | ID | 26th Aug 2014 |
| 103.37.176.0/22 | 1k | APNIC | CN | 26th Aug 2014 |
| 103.37.188.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.37.208.0/22 | 1k | APNIC | CN | 27th Aug 2014 |
| 103.37.212.0/22 | 1k | APNIC | CN | 27th Aug 2014 |
| 103.37.216.0/21 | 2k | APNIC | CN | 27th Aug 2014 |
| 103.37.22.0/23 | 512 | APNIC |  IN | 26th Jul 2022 |
| 103.37.230.0/23 | 512 | APNIC | ID | 29th Aug 2014 |
| 103.37.236.0/22 | 1k | APNIC |  KH | 29th Aug 2014 |
| 103.37.24.0/22 | 1k | APNIC | CN | 19th Aug 2014 |
| 103.37.244.0/22 | 1k | APNIC | ID | 29th Aug 2014 |
| 103.37.252.0/22 | 1k | APNIC | CN | 29th Aug 2014 |
| 103.37.36.0/22 | 1k | APNIC | TW | 19th Aug 2014 |
| 103.37.52.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 103.37.56.0/22 | 1k | APNIC | CN | 21st Aug 2014 |
| 103.38.0.0/22 | 1k | APNIC | CN | 29th Aug 2014 |
| 103.38.132.0/22 | 1k | APNIC | CN | 5th Sept 2014 |
| 103.38.140.0/22 | 1k | APNIC | CN | 5th Sept 2014 |
| 103.38.146.0/23 | 512 | APNIC | TW | 8th Sept 2014 |
| 103.38.150.0/24 | 256 | APNIC | IN | 9th Sept 2014 |
| 103.38.212.0/22 | 1k | APNIC |  PH | 12th Sept 2014 |
| 103.38.216.0/23 | 512 | APNIC | ID | 28th Aug 2023 |
| 103.38.228.0/22 | 1k | APNIC | CN | 12th Sept 2014 |
| 103.38.32.0/22 | 1k | APNIC | CN | 2nd Sept 2014 |
| 103.38.44.0/22 | 1k | APNIC | CN | 2nd Sept 2014 |
| 103.38.56.0/22 | 1k | APNIC | CN | 3rd Sept 2014 |
| 103.38.60.0/22 | 1k | APNIC |  MY | 3rd Sept 2014 |
| 103.38.84.0/22 | 1k | APNIC | CN | 4th Sept 2014 |
| 103.38.96.0/22 | 1k | APNIC | CN | 4th Sept 2014 |
| 103.39.100.0/22 | 1k | APNIC | CN | 22nd Sept 2014 |
| 103.39.104.0/22 | 1k | APNIC | CN | 22nd Sept 2014 |
| 103.39.113.0/24 | 256 | APNIC |  JP | 24th Sept 2014 |
| 103.39.160.0/22 | 1k | APNIC | CN | 24th Sept 2014 |