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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.146.108.0/23 | 512 | APNIC |  IN | 11th Dec 2019 |
| 103.146.114.0/23 | 512 | APNIC |  JP | 12th Dec 2019 |
| 103.146.138.0/23 | 512 | APNIC |  CN | 15th Dec 2019 |
| 103.146.164.0/23 | 512 | APNIC |  TW | 17th Dec 2019 |
| 103.146.172.0/23 | 512 | APNIC | IN | 17th Dec 2019 |
| 103.146.192.0/23 | 512 | APNIC |  NZ | 18th Dec 2019 |
| 103.146.236.0/23 | 512 | APNIC | CN | 20th Dec 2019 |
| 103.146.254.0/23 | 512 | APNIC | IN | 23rd Dec 2019 |
| 103.146.28.0/23 | 512 | APNIC |  ID | 3rd Dec 2019 |
| 103.146.46.0/24 | 256 | APNIC | IN | 4th Dec 2019 |
| 103.146.6.0/23 | 512 | APNIC |  AU | 9th May 2024 |
| 103.146.68.0/23 | 512 | APNIC |  BD | 9th Dec 2019 |
| 103.146.70.0/23 | 512 | APNIC | ID | 9th Dec 2019 |
| 103.146.72.0/23 | 512 | APNIC | CN | 9th Dec 2019 |
| 103.147.102.0/23 | 512 | APNIC | ID | 9th Jan 2020 |
| 103.147.116.0/23 | 512 | APNIC | ID | 10th Jan 2020 |
| 103.147.140.0/23 | 512 | APNIC | ID | 13th Jan 2020 |
| 103.147.142.0/23 | 512 | APNIC | ID | 13th Jan 2020 |
| 103.147.144.0/23 | 512 | APNIC | ID | 13th Jan 2020 |
| 103.147.146.0/23 | 512 | APNIC | ID | 13th Jan 2020 |
| 103.147.148.0/23 | 512 | APNIC | ID | 13th Jan 2020 |
| 103.147.164.0/23 | 512 | APNIC | ID | 15th Jan 2020 |
| 103.147.178.0/23 | 512 | APNIC | IN | 16th Jan 2020 |
| 103.147.188.0/23 | 512 | APNIC |  VN | 17th Jan 2020 |
| 103.147.193.0/24 | 256 | APNIC | IN | 17th Jan 2020 |
| 103.147.194.0/23 | 512 | APNIC |  FJ | 19th Jan 2020 |
| 103.147.20.0/23 | 512 | APNIC |  HK | 23rd Dec 2019 |
| 103.147.206.0/23 | 512 | APNIC | CN | 20th Jan 2020 |
| 103.147.214.0/23 | 512 | APNIC | ID | 21st Jan 2020 |
| 103.147.253.0/24 | 256 | APNIC | ID | 27th Jan 2020 |
| 103.147.45.0/24 | 256 | APNIC | HK | 31st Dec 2019 |
| 103.147.50.0/23 | 512 | APNIC | ID | 31st Dec 2019 |
| 103.147.54.0/23 | 512 | APNIC | ID | 31st Dec 2019 |
| 103.147.61.0/24 | 256 | APNIC | AU | 3rd Jan 2020 |
| 103.147.64.0/23 | 512 | APNIC | ID | 3rd Jan 2020 |
| 103.147.66.0/23 | 512 | APNIC | ID | 3rd Jan 2020 |
| 103.147.74.0/23 | 512 | APNIC | ID | 6th Jan 2020 |
| 103.147.94.0/23 | 512 | APNIC | IN | 8th Jan 2020 |
| 103.148.146.0/23 | 512 | APNIC | TW | 15th Feb 2020 |
| 103.148.156.0/23 | 512 | APNIC | IN | 17th Feb 2020 |
| 103.148.172.0/23 | 512 | RIPE NCC |  SA | 18th Feb 2020 |
| 103.148.174.0/23 | 512 | APNIC | CN | 19th Feb 2020 |
| 103.148.226.0/23 | 512 | APNIC | HK | 25th Feb 2020 |
| 103.148.236.0/23 | 512 | APNIC |  US | 26th Feb 2020 |
| 103.148.252.0/23 | 512 | APNIC | ID | 28th Feb 2020 |
| 103.148.30.0/23 | 512 | APNIC | JP | 30th Jan 2020 |
| 103.148.48.0/23 | 512 | APNIC | ID | 3rd Feb 2020 |
| 103.148.68.0/23 | 512 | APNIC | TW | 6th Feb 2020 |
| 103.148.70.0/23 | 512 | APNIC |  AF | 6th Feb 2020 |
| 103.148.80.0/23 | 512 | APNIC | ID | 7th Feb 2020 |