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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,818 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.190.168.0/23 | 512 | APNIC |  TW | 6th Jul 2022 |
| 103.190.20.0/23 | 512 | APNIC |  CN | 24th Jun 2022 |
| 103.190.24.0/23 | 512 | APNIC |  IN | 24th Jun 2022 |
| 103.190.71.0/24 | 256 | APNIC | CN | 30th Jun 2022 |
| 103.190.98.0/23 | 512 | APNIC | IN | 30th Jun 2022 |
| 103.191.138.0/23 | 512 | APNIC | IN | 18th Jul 2022 |
| 103.191.157.0/24 | 256 | APNIC |  ID | 20th Jul 2022 |
| 103.191.18.0/24 | 256 | APNIC |  PK | 11th Jul 2022 |
| 103.191.20.0/23 | 512 | APNIC | TW | 11th Jul 2022 |
| 103.191.26.0/23 | 512 | APNIC | IN | 11th Jul 2022 |
| 103.191.70.0/23 | 512 | APNIC | ID | 13th Jul 2022 |
| 103.191.94.0/24 | 256 | APNIC | ID | 14th Jul 2022 |
| 103.192.100.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.192.104.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.192.108.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.192.112.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.192.120.0/22 | 1k | APNIC |  JP | 18th Jul 2015 |
| 103.192.124.0/22 | 1k | APNIC |  PH | 20th Jul 2015 |
| 103.192.128.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 103.192.136.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 103.192.140.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 103.192.144.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 103.192.164.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 103.192.168.0/22 | 1k | APNIC | IN | 20th Jul 2015 |
| 103.192.196.0/24 | 256 | APNIC |  AU | 22nd Jul 2015 |
| 103.192.216.0/22 | 1k | APNIC | CN | 22nd Jul 2015 |
| 103.192.220.0/22 | 1k | APNIC | IN | 22nd Jul 2015 |
| 103.192.228.0/22 | 1k | APNIC | JP | 23rd Jul 2015 |
| 103.192.236.0/22 | 1k | APNIC |  VN | 23rd Jul 2015 |
| 103.192.244.0/22 | 1k | APNIC | IN | 23rd Jul 2015 |
| 103.192.248.0/22 | 1k | APNIC | IN | 23rd Jul 2015 |
| 103.192.4.0/22 | 1k | APNIC | CN | 15th Jul 2015 |
| 103.192.48.0/22 | 1k | APNIC | CN | 16th Jul 2015 |
| 103.192.52.0/22 | 1k | APNIC | CN | 16th Jul 2015 |
| 103.192.56.0/22 | 1k | APNIC | CN | 16th Jul 2015 |
| 103.192.60.0/22 | 1k | APNIC | IN | 16th Jul 2015 |
| 103.192.72.0/22 | 1k | APNIC | IN | 16th Jul 2015 |
| 103.192.84.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.192.88.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.192.92.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.192.96.0/22 | 1k | APNIC | CN | 17th Jul 2015 |
| 103.193.0.0/22 | 1k | APNIC | IN | 23rd Jul 2015 |
| 103.193.100.0/22 | 1k | APNIC | IN | 28th Jul 2015 |
| 103.193.104.0/22 | 1k | APNIC | IN | 28th Jul 2015 |
| 103.193.108.0/22 | 1k | APNIC | IN | 28th Jul 2015 |
| 103.193.112.0/22 | 1k | APNIC | IN | 28th Jul 2015 |
| 103.193.120.0/22 | 1k | APNIC | CN | 28th Jul 2015 |
| 103.193.140.0/22 | 1k | APNIC | CN | 29th Jul 2015 |
| 103.193.152.0/22 | 1k | APNIC | IN | 29th Jul 2015 |
| 103.193.156.0/22 | 1k | APNIC | IN | 29th Jul 2015 |