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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,906 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.213.196.0/23 | 512 | APNIC |  CN | 5th Jun 2023 |
| 103.213.198.0/23 | 512 | APNIC | CN | 5th Jun 2023 |
| 103.213.224.0/24 | 256 | APNIC |  IN | 5th Jun 2023 |
| 103.213.226.0/23 | 512 | APNIC | CN | 5th Jun 2023 |
| 103.213.232.0/23 | 512 | APNIC | CN | 6th Jun 2023 |
| 103.213.24.0/22 | 1k | APNIC | IN | 1st Apr 2016 |
| 103.213.254.0/23 | 512 | APNIC |  NP | 6th Jun 2023 |
| 103.213.32.0/22 | 1k | APNIC | IN | 1st Apr 2016 |
| 103.213.40.0/22 | 1k | APNIC | CN | 2nd Apr 2016 |
| 103.213.44.0/22 | 1k | APNIC | CN | 2nd Apr 2016 |
| 103.213.6.0/23 | 512 | APNIC | IN | 2nd Jun 2023 |
| 103.214.120.0/23 | 512 | APNIC |  ID | 12th Apr 2016 |
| 103.214.152.0/22 | 1k | APNIC |  JP | 13th Apr 2016 |
| 103.214.180.0/22 | 1k | RIPE NCC |  DE | 13th Apr 2016 |
| 103.214.212.0/22 | 1k | APNIC | CN | 14th Apr 2016 |
| 103.214.224.0/23 | 512 | APNIC | IN | 6th Jun 2023 |
| 103.214.230.0/23 | 512 | APNIC | IN | 18th Apr 2016 |
| 103.214.24.0/22 | 1k | APNIC |  KR | 7th Apr 2016 |
| 103.214.240.0/22 | 1k | APNIC | CN | 18th Apr 2016 |
| 103.214.244.0/22 | 1k | APNIC | CN | 18th Apr 2016 |
| 103.214.248.0/23 | 512 | APNIC |  IM | 6th Jun 2023 |
| 103.214.28.0/23 | 512 | APNIC |  AU | 8th Apr 2016 |
| 103.214.72.0/22 | 1k | APNIC | JP | 11th Apr 2016 |
| 103.214.84.0/22 | 1k | APNIC | CN | 11th Apr 2016 |
| 103.215.100.0/22 | 1k | APNIC | CN | 21st Apr 2016 |
| 103.215.108.0/22 | 1k | APNIC | CN | 21st Apr 2016 |
| 103.215.116.0/22 | 1k | APNIC | CN | 21st Apr 2016 |
| 103.215.120.0/22 | 1k | APNIC | CN | 21st Apr 2016 |
| 103.215.184.0/23 | 512 | APNIC | IN | 8th Jun 2023 |
| 103.215.188.0/22 | 1k | APNIC |  HK | 26th Apr 2016 |
| 103.215.196.0/22 | 1k | APNIC | IN | 26th Apr 2016 |
| 103.215.20.0/23 | 512 | ARIN |  US | 3rd Feb 2025 |
| 103.215.23.0/24 | 256 | APNIC | AU | 21st Apr 2016 |
| 103.215.235.0/24 | 256 | APNIC | IN | 28th Apr 2016 |
| 103.215.252.0/22 | 1k | APNIC | JP | 27th Apr 2016 |
| 103.215.28.0/22 | 1k | APNIC | CN | 19th Apr 2016 |
| 103.215.32.0/22 | 1k | APNIC | CN | 19th Apr 2016 |
| 103.215.62.0/23 | 512 | APNIC | ID | 7th Jun 2023 |
| 103.215.88.0/22 | 1k | APNIC | AU | 21st Apr 2016 |
| 103.215.94.0/23 | 512 | APNIC |  VN | 7th Jun 2023 |
| 103.216.108.0/22 | 1k | APNIC | CN | 29th Apr 2016 |
| 103.216.12.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.133.0/24 | 256 | APNIC | AU | 29th Apr 2016 |
| 103.216.148.0/22 | 1k | APNIC | IN | 29th Apr 2016 |
| 103.216.156.0/23 | 512 | APNIC | CN | 18th Aug 2023 |
| 103.216.16.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.164.0/22 | 1k | APNIC | IN | 2nd May 2016 |
| 103.216.180.0/22 | 1k | APNIC | IN | 2nd May 2016 |
| 103.216.20.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.224.0/22 | 1k | APNIC | CN | 4th May 2016 |