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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through APNIC, largest first.
Unannounced blocks registered through APNIC
22,591 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.251.172.0/22 | 1k | APNIC |  CN | 29th May 2016 |
| 45.251.176.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.180.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.184.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.188.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.192.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.196.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.200.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.204.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.208.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.212.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.216.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.220.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.224.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.244.0/22 | 1k | APNIC |  IN | 30th May 2016 |
| 45.251.252.0/22 | 1k | APNIC | IN | 30th May 2016 |
| 45.251.52.0/22 | 1k | APNIC | CN | 24th May 2016 |
| 45.251.80.0/22 | 1k | APNIC | IN | 25th May 2016 |
| 45.251.84.0/22 | 1k | APNIC | CN | 26th May 2016 |
| 45.252.108.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.112.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.116.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.12.0/22 | 1k | APNIC | CN | 31st May 2016 |
| 45.252.120.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.124.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.128.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.132.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.136.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.140.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.148.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.152.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.156.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.16.0/22 | 1k | APNIC | CN | 31st May 2016 |
| 45.252.160.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.164.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.168.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.172.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.176.0/22 | 1k | APNIC | CN | 1st Jun 2016 |
| 45.252.192.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.196.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.20.0/22 | 1k | APNIC | CN | 31st May 2016 |
| 45.252.200.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.204.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.208.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.212.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.216.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.220.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.224.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.228.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |
| 45.252.232.0/22 | 1k | APNIC | CN | 2nd Jun 2016 |