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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
Browse by country
Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,871 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.193.165.0/24 | 256 | RIPE NCC |  UA | 31st Jul 2015 |
| 103.193.20.0/22 | 1k | APNIC |  IN | 24th Jul 2015 |
| 103.193.212.0/22 | 1k | APNIC |  CN | 3rd Aug 2015 |
| 103.193.216.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 103.193.220.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 103.193.224.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 103.193.228.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 103.193.232.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 103.193.236.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 103.193.24.0/22 | 1k | APNIC | IN | 24th Jul 2015 |
| 103.193.252.0/23 | 512 | APNIC |  TL | 3rd Aug 2015 |
| 103.193.254.0/24 | 256 | APNIC | TL | 3rd Aug 2015 |
| 103.193.28.0/22 | 1k | APNIC | IN | 24th Jul 2015 |
| 103.193.32.0/22 | 1k | APNIC |  HK | 27th Jul 2015 |
| 103.193.40.0/22 | 1k | APNIC | CN | 27th Jul 2015 |
| 103.193.44.0/22 | 1k | APNIC | CN | 27th Jul 2015 |
| 103.193.48.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 103.193.52.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 103.193.56.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 103.193.60.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 103.193.64.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 103.193.84.0/22 | 1k | APNIC | IN | 28th Jul 2015 |
| 103.193.92.0/22 | 1k | APNIC | IN | 28th Jul 2015 |
| 103.193.96.0/22 | 1k | APNIC | IN | 28th Jul 2015 |
| 103.194.116.0/22 | 1k | APNIC | IN | 7th Aug 2015 |
| 103.194.12.0/22 | 1k | APNIC | IN | 4th Aug 2015 |
| 103.194.122.0/23 | 512 | APNIC | IN | 7th Aug 2015 |
| 103.194.128.0/23 | 512 | APNIC | IN | 7th Aug 2015 |
| 103.194.130.0/24 | 256 | APNIC |  ID | 11th Aug 2015 |
| 103.194.132.0/22 | 1k | APNIC | IN | 7th Aug 2015 |
| 103.194.136.0/21 | 2k | APNIC | IN | 7th Aug 2015 |
| 103.194.144.0/22 | 1k | APNIC | IN | 7th Aug 2015 |
| 103.194.156.0/22 | 1k | APNIC | IN | 10th Aug 2015 |
| 103.194.16.0/22 | 1k | APNIC | CN | 4th Aug 2015 |
| 103.194.160.0/22 | 1k | APNIC | IN | 12th Aug 2015 |
| 103.194.180.0/22 | 1k | APNIC | IN | 13th Aug 2015 |
| 103.194.196.0/22 | 1k | APNIC | IN | 18th Aug 2015 |
| 103.194.20.0/22 | 1k | APNIC | IN | 4th Aug 2015 |
| 103.194.200.0/22 | 1k | APNIC | IN | 18th Aug 2015 |
| 103.194.204.0/22 | 1k | APNIC | IN | 18th Aug 2015 |
| 103.194.208.0/22 | 1k | APNIC | IN | 18th Aug 2015 |
| 103.194.220.0/22 | 1k | APNIC | IN | 18th Aug 2015 |
| 103.194.224.0/22 | 1k | APNIC | IN | 18th Aug 2015 |
| 103.194.230.0/23 | 512 | APNIC |  SG | 19th Aug 2015 |
| 103.194.28.0/22 | 1k | APNIC | IN | 4th Aug 2015 |
| 103.194.36.0/22 | 1k | APNIC | HK | 5th Aug 2015 |
| 103.194.52.0/22 | 1k | APNIC | IN | 5th Aug 2015 |
| 103.194.56.0/22 | 1k | APNIC | IN | 5th Aug 2015 |
| 103.194.60.0/22 | 1k | APNIC | IN | 5th Aug 2015 |
| 103.194.64.0/22 | 1k | APNIC | IN | 5th Aug 2015 |