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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,778 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.153.122.0/23 | 512 | APNIC |  CN | 19th Jul 2020 |
| 103.153.126.0/23 | 512 | APNIC |  ID | 20th Jul 2020 |
| 103.153.13.0/24 | 256 | APNIC |  MM | 8th Jul 2020 |
| 103.153.132.0/23 | 512 | APNIC | CN | 20th Jul 2020 |
| 103.153.146.0/23 | 512 | APNIC | CN | 22nd Jul 2020 |
| 103.153.16.0/23 | 512 | APNIC |  HK | 8th Jul 2020 |
| 103.153.160.0/23 | 512 | APNIC | CN | 23rd Jul 2020 |
| 103.153.200.0/23 | 512 | APNIC |  TW | 27th Jul 2020 |
| 103.153.203.0/24 | 256 | APNIC |  AU | 27th Jul 2020 |
| 103.153.226.0/24 | 256 | APNIC |  IN | 28th Jul 2020 |
| 103.153.23.0/24 | 256 | APNIC | ID | 8th Jul 2020 |
| 103.153.234.0/23 | 512 | APNIC |  PH | 29th Jul 2020 |
| 103.153.244.0/24 | 256 | APNIC | ID | 30th Jul 2020 |
| 103.153.26.0/23 | 512 | APNIC |  JP | 9th Jul 2020 |
| 103.153.31.0/24 | 256 | APNIC | ID | 10th Jul 2020 |
| 103.153.47.0/24 | 256 | APNIC | AU | 13th Jul 2020 |
| 103.153.55.0/24 | 256 | APNIC |  SG | 13th Jul 2020 |
| 103.153.6.0/23 | 512 | APNIC |  FR | 7th Jul 2020 |
| 103.153.80.0/24 | 256 | APNIC |  AF | 14th Jul 2020 |
| 103.154.104.0/24 | 256 | APNIC | HK | 11th Aug 2020 |
| 103.154.107.0/24 | 256 | APNIC |  PK | 17th Aug 2020 |
| 103.154.164.0/23 | 512 | APNIC | CN | 14th Aug 2020 |
| 103.154.166.0/23 | 512 | APNIC |  VN | 14th Aug 2020 |
| 103.154.168.0/23 | 512 | APNIC | CN | 14th Aug 2020 |
| 103.154.18.0/23 | 512 | APNIC | CN | 3rd Aug 2020 |
| 103.154.182.0/23 | 512 | APNIC | HK | 14th Aug 2020 |
| 103.154.190.0/23 | 512 | APNIC | IN | 17th Aug 2020 |
| 103.154.199.0/24 | 256 | APNIC | AU | 19th Aug 2020 |
| 103.154.208.0/23 | 512 | APNIC | IN | 18th Aug 2020 |
| 103.154.254.0/23 | 512 | APNIC | IN | 21st Aug 2020 |
| 103.154.32.0/23 | 512 | APNIC | CN | 5th Aug 2020 |
| 103.154.42.0/24 | 256 | APNIC | JP | 5th Aug 2020 |
| 103.154.43.0/24 | 256 | APNIC | ID | 2nd Feb 2023 |
| 103.154.51.0/24 | 256 | APNIC | IN | 7th Aug 2020 |
| 103.154.66.0/23 | 512 | APNIC | CN | 7th Aug 2020 |
| 103.154.96.0/23 | 512 | APNIC |  TO | 10th Aug 2020 |
| 103.154.99.0/24 | 256 | APNIC | IN | 11th Aug 2020 |
| 103.155.104.0/24 | 256 | APNIC | ID | 4th Sept 2020 |
| 103.155.112.0/24 | 256 | APNIC |  PG | 7th Sept 2020 |
| 103.155.134.0/23 | 512 | APNIC | IN | 8th Sept 2020 |
| 103.155.14.0/23 | 512 | APNIC | CN | 24th Aug 2020 |
| 103.155.147.0/24 | 256 | APNIC | IN | 11th Sept 2020 |
| 103.155.152.0/23 | 512 | APNIC | ID | 10th Sept 2020 |
| 103.155.158.0/23 | 512 | APNIC | ID | 11th Sept 2020 |
| 103.155.164.0/23 | 512 | APNIC | VN | 11th Sept 2020 |
| 103.155.172.0/23 | 512 | APNIC | IN | 11th Sept 2020 |
| 103.155.214.0/23 | 512 | APNIC | CN | 16th Sept 2020 |
| 103.155.220.0/24 | 256 | APNIC | IN | 17th Sept 2020 |
| 103.155.224.0/23 | 512 | APNIC | ID | 17th Sept 2020 |
| 103.155.244.0/23 | 512 | APNIC | HK | 18th Sept 2020 |