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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 45.126.200.0/21 | 2k | APNIC |  IN | 7th Sept 2015 |
| 45.126.212.0/22 | 1k | APNIC |  CN | 8th Sept 2015 |
| 45.126.220.0/22 | 1k | APNIC | CN | 9th Sept 2015 |
| 45.126.224.0/22 | 1k | APNIC |  TH | 9th Sept 2015 |
| 45.126.232.0/21 | 2k | APNIC | IN | 9th Sept 2015 |
| 45.126.240.0/22 | 1k | APNIC |  HK | 10th Sept 2015 |
| 45.126.28.0/22 | 1k | APNIC | IN | 26th Aug 2015 |
| 45.126.32.0/22 | 1k | APNIC | IN | 26th Aug 2015 |
| 45.126.48.0/22 | 1k | APNIC | CN | 27th Aug 2015 |
| 45.126.52.0/22 | 1k | APNIC | CN | 28th Aug 2015 |
| 45.126.64.0/21 | 2k | APNIC | IN | 28th Aug 2015 |
| 45.126.72.0/23 | 512 | APNIC |  BD | 8th Aug 2018 |
| 45.127.12.0/22 | 1k | APNIC | CN | 11th Sept 2015 |
| 45.127.140.0/22 | 1k | APNIC |  BN | 18th Sept 2015 |
| 45.127.156.0/22 | 1k | APNIC | CN | 18th Sept 2015 |
| 45.127.16.0/21 | 2k | APNIC | IN | 11th Sept 2015 |
| 45.127.172.0/22 | 1k | APNIC |  AU | 22nd Sept 2015 |
| 45.127.212.0/22 | 1k | APNIC | IN | 28th Sept 2015 |
| 45.127.24.0/22 | 1k | APNIC | IN | 11th Sept 2015 |
| 45.127.240.0/22 | 1k | APNIC | IN | 29th Sept 2015 |
| 45.127.40.0/22 | 1k | APNIC | IN | 14th Sept 2015 |
| 45.127.52.0/22 | 1k | APNIC | IN | 14th Sept 2015 |
| 45.127.76.0/22 | 1k | APNIC | IN | 14th Sept 2015 |
| 45.127.8.0/22 | 1k | APNIC | CN | 11th Sept 2015 |
| 45.127.80.0/21 | 2k | APNIC | IN | 14th Sept 2015 |
| 45.127.92.0/22 | 1k | APNIC | AU | 15th Sept 2015 |
| 45.128.164.0/22 | 1k | RIPE NCC |  AT | 12th Jul 2019 |
| 45.128.192.0/22 | 1k | RIPE NCC |  SE | 12th Jul 2019 |
| 45.128.224.0/22 | 1k | RIPE NCC |  DE | 12th Jul 2019 |
| 45.128.252.0/22 | 1k | RIPE NCC | DE | 12th Jul 2019 |
| 45.128.28.0/22 | 1k | RIPE NCC | AT | 11th Jul 2019 |
| 45.128.72.0/22 | 1k | RIPE NCC |  CY | 11th Jul 2019 |
| 45.129.188.0/22 | 1k | RIPE NCC | SE | 16th Jul 2019 |
| 45.129.28.0/22 | 1k | RIPE NCC | AT | 15th Jul 2019 |
| 45.129.75.0/24 | 256 | RIPE NCC |  NO | 13th Oct 2025 |
| 45.129.85.0/24 | 256 | RIPE NCC |  BG | 15th Jul 2019 |
| 45.129.93.0/24 | 256 | RIPE NCC | DE | 15th Jul 2019 |
| 45.13.138.0/23 | 512 | RIPE NCC |  SK | 3rd May 2019 |
| 45.13.170.0/24 | 256 | RIPE NCC |  ES | 6th May 2019 |
| 45.13.204.0/22 | 1k | RIPE NCC |  CH | 7th May 2019 |
| 45.13.216.0/22 | 1k | RIPE NCC | DE | 7th May 2019 |
| 45.13.244.0/22 | 1k | RIPE NCC | AT | 7th May 2019 |
| 45.13.25.0/24 | 256 | RIPE NCC |  RO | 7th Mar 2023 |
| 45.13.26.0/24 | 256 | RIPE NCC |  RS | 7th Mar 2023 |
| 45.13.44.0/22 | 1k | RIPE NCC |  FR | 3rd May 2019 |
| 45.130.168.0/22 | 1k | RIPE NCC |  RU | 18th Jul 2019 |
| 45.130.180.0/22 | 1k | RIPE NCC | DE | 18th Jul 2019 |
| 45.130.204.0/22 | 1k | RIPE NCC | AT | 18th Jul 2019 |
| 45.130.212.0/22 | 1k | RIPE NCC | RU | 18th Jul 2019 |
| 45.130.216.0/22 | 1k | RIPE NCC |  NL | 18th Jul 2019 |