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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,584 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.124.116.0/22 | 1k | APNIC |  IN | 23rd Jul 2015 |
| 45.124.120.0/22 | 1k | APNIC | IN | 23rd Jul 2015 |
| 45.124.128.0/22 | 1k | APNIC | IN | 23rd Jul 2015 |
| 45.124.148.0/22 | 1k | APNIC | IN | 24th Jul 2015 |
| 45.124.152.0/22 | 1k | APNIC | IN | 24th Jul 2015 |
| 45.124.156.0/22 | 1k | APNIC | IN | 24th Jul 2015 |
| 45.124.16.0/22 | 1k | APNIC |  PH | 20th Jul 2015 |
| 45.124.160.0/22 | 1k | APNIC |  HK | 27th Jul 2015 |
| 45.124.164.0/22 | 1k | APNIC |  AU | 27th Jul 2015 |
| 45.124.172.0/22 | 1k | APNIC |  CN | 27th Jul 2015 |
| 45.124.176.0/22 | 1k | APNIC | CN | 27th Jul 2015 |
| 45.124.180.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 45.124.192.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 45.124.196.0/22 | 1k | APNIC | IN | 27th Jul 2015 |
| 45.124.208.0/22 | 1k | APNIC | CN | 28th Jul 2015 |
| 45.124.224.0/20 | 4.1k | APNIC | IN | 28th Jul 2015 |
| 45.124.240.0/21 | 2k | APNIC | IN | 28th Jul 2015 |
| 45.124.248.0/22 | 1k | APNIC | CN | 28th Jul 2015 |
| 45.124.28.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 45.124.32.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 45.124.36.0/22 | 1k | APNIC | CN | 20th Jul 2015 |
| 45.125.100.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 45.125.116.0/22 | 1k | APNIC | IN | 3rd Aug 2015 |
| 45.125.132.0/22 | 1k | APNIC | IN | 4th Aug 2015 |
| 45.125.136.0/22 | 1k | APNIC | CN | 4th Aug 2015 |
| 45.125.140.0/22 | 1k | APNIC | IN | 4th Aug 2015 |
| 45.125.144.0/22 | 1k | APNIC | IN | 4th Aug 2015 |
| 45.125.148.0/22 | 1k | APNIC | IN | 4th Aug 2015 |
| 45.125.160.0/22 | 1k | APNIC | HK | 5th Aug 2015 |
| 45.125.172.0/22 | 1k | APNIC | IN | 5th Aug 2015 |
| 45.125.176.0/22 | 1k | APNIC | IN | 5th Aug 2015 |
| 45.125.180.0/22 | 1k | APNIC | IN | 5th Aug 2015 |
| 45.125.184.0/22 | 1k | APNIC | IN | 5th Aug 2015 |
| 45.125.212.0/22 | 1k | APNIC | IN | 6th Aug 2015 |
| 45.125.226.0/23 | 512 | APNIC |  BN | 9th Oct 2026 |
| 45.125.248.0/22 | 1k | APNIC | PH | 7th Aug 2015 |
| 45.125.252.0/22 | 1k | APNIC | IN | 7th Aug 2015 |
| 45.125.28.0/23 | 512 | APNIC | IN | 8th Oct 2026 |
| 45.125.36.0/22 | 1k | APNIC | IN | 29th Jul 2015 |
| 45.125.40.0/22 | 1k | APNIC | IN | 29th Jul 2015 |
| 45.125.52.0/22 | 1k | APNIC | CN | 31st Jul 2015 |
| 45.125.76.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 45.125.80.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 45.125.84.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 45.125.88.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 45.125.92.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 45.125.96.0/22 | 1k | APNIC | CN | 3rd Aug 2015 |
| 45.126.100.0/22 | 1k | APNIC | CN | 1st Sept 2015 |
| 45.126.104.0/22 | 1k | APNIC | IN | 1st Sept 2015 |
| 45.126.108.0/22 | 1k | APNIC | CN | 2nd Sept 2015 |