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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.250.52.0/22 | 1k | APNIC |  IN | 16th May 2016 |
| 45.250.56.0/22 | 1k | APNIC | IN | 16th May 2016 |
| 45.250.72.0/22 | 1k | APNIC |  US | 17th May 2016 |
| 45.250.76.0/22 | 1k | APNIC |  CN | 17th May 2016 |
| 45.250.80.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.84.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.88.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.92.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.250.96.0/22 | 1k | APNIC | CN | 17th May 2016 |
| 45.251.0.0/22 | 1k | APNIC | CN | 20th May 2016 |
| 45.251.124.0/22 | 1k | APNIC | CN | 26th May 2016 |
| 45.251.140.0/22 | 1k | APNIC | CN | 27th May 2016 |
| 45.251.144.0/22 | 1k | APNIC | CN | 27th May 2016 |
| 45.251.148.0/22 | 1k | APNIC | CN | 27th May 2016 |
| 45.251.152.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.156.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.16.0/22 | 1k | APNIC | CN | 20th May 2016 |
| 45.251.160.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.164.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 45.251.168.0/22 | 1k | APNIC | CN | 29th May 2016 |
| 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 |