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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,783 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.158.24.0/23 | 512 | APNIC |  ID | 3rd Nov 2020 |
| 103.158.29.0/24 | 256 | APNIC |  HK | 4th Nov 2020 |
| 103.158.41.0/24 | 256 | APNIC |  IN | 4th Nov 2020 |
| 103.158.50.0/24 | 256 | APNIC | IN | 4th Nov 2020 |
| 103.158.7.0/24 | 256 | APNIC |  AU | 30th Oct 2020 |
| 103.158.70.0/23 | 512 | APNIC | ID | 6th Nov 2020 |
| 103.158.72.0/23 | 512 | APNIC | ID | 6th Nov 2020 |
| 103.158.76.0/23 | 512 | APNIC |  TW | 6th Nov 2020 |
| 103.158.78.0/23 | 512 | APNIC | TW | 6th Nov 2020 |
| 103.158.8.0/23 | 512 | APNIC |  CN | 30th Oct 2020 |
| 103.159.108.0/23 | 512 | APNIC | IN | 27th Nov 2020 |
| 103.159.12.0/23 | 512 | APNIC | ID | 24th Nov 2020 |
| 103.159.134.0/23 | 512 | APNIC | CN | 1st Dec 2020 |
| 103.159.137.0/24 | 256 | APNIC | IN | 2nd Dec 2020 |
| 103.159.14.0/23 | 512 | APNIC | ID | 24th Nov 2020 |
| 103.159.142.0/23 | 512 | APNIC | CN | 2nd Dec 2020 |
| 103.159.146.0/24 | 256 | APNIC | ID | 2nd Dec 2020 |
| 103.159.148.0/23 | 512 | APNIC | IN | 2nd Dec 2020 |
| 103.159.150.0/23 | 512 | APNIC | IN | 2nd Dec 2020 |
| 103.159.16.0/23 | 512 | APNIC | ID | 24th Nov 2020 |
| 103.159.174.0/23 | 512 | APNIC | IN | 4th Dec 2020 |
| 103.159.178.0/23 | 512 | APNIC | IN | 4th Dec 2020 |
| 103.159.18.0/23 | 512 | APNIC | ID | 24th Nov 2020 |
| 103.159.215.0/24 | 256 | APNIC | ID | 8th Dec 2020 |
| 103.159.240.0/23 | 512 | APNIC | IN | 9th Dec 2020 |
| 103.159.244.0/23 | 512 | APNIC | IN | 9th Dec 2020 |
| 103.159.246.0/23 | 512 | APNIC | IN | 9th Dec 2020 |
| 103.159.252.0/24 | 256 | APNIC | IN | 9th Dec 2020 |
| 103.159.3.0/24 | 256 | APNIC |  TH | 23rd Nov 2020 |
| 103.159.56.0/23 | 512 | APNIC |  VN | 25th Nov 2020 |
| 103.159.62.0/23 | 512 | APNIC | ID | 25th Nov 2020 |
| 103.159.71.0/24 | 256 | APNIC |  SG | 25th Nov 2020 |
| 103.159.94.0/23 | 512 | APNIC | ID | 27th Nov 2020 |
| 103.16.108.0/22 | 1k | APNIC | CN | 5th Feb 2013 |
| 103.16.112.0/22 | 1k | APNIC | ID | 5th Feb 2013 |
| 103.16.118.0/23 | 512 | APNIC | ID | 30th Sept 2022 |
| 103.16.164.0/22 | 1k | APNIC | IN | 8th Feb 2013 |
| 103.16.197.0/24 | 256 | APNIC | ID | 11th Feb 2013 |
| 103.16.212.0/23 | 512 | APNIC | VN | 3rd Oct 2022 |
| 103.16.223.0/24 | 256 | APNIC | ID | 18th Feb 2013 |
| 103.16.240.0/22 | 1k | APNIC | TW | 19th Feb 2013 |
| 103.16.244.0/22 | 1k | APNIC | TW | 19th Feb 2013 |
| 103.16.26.0/23 | 512 | APNIC | HK | 31st Jan 2013 |
| 103.16.4.0/23 | 512 | APNIC |  NZ | 17th Apr 2024 |
| 103.16.47.0/24 | 256 | APNIC | IN | 1st Feb 2013 |
| 103.16.48.0/23 | 512 | APNIC | ID | 1st Feb 2013 |
| 103.16.52.0/22 | 1k | APNIC | CN | 1st Feb 2013 |
| 103.16.77.0/24 | 256 | APNIC | ID | 5th Feb 2013 |
| 103.16.8.0/22 | 1k | APNIC |  JP | 30th Jan 2013 |
| 103.16.80.0/22 | 1k | APNIC | CN | 4th Feb 2013 |