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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 45.183.120.0/23 | 512 | LACNIC |  DO | 26th Nov 2024 |
| 45.183.4.0/22 | 1k | RIPE NCC |  AE | 13th Sept 2019 |
| 45.184.116.0/22 | 1k | LACNIC |  AR | 17th Sept 2019 |
| 45.184.132.0/22 | 1k | LACNIC | DO | 14th Oct 2019 |
| 45.184.144.0/22 | 1k | LACNIC |  BR | 10th Sept 2019 |
| 45.185.149.0/24 | 256 | LACNIC | BR | 22nd Oct 2019 |
| 45.185.43.0/24 | 256 | LACNIC |  CR | 23rd Sept 2019 |
| 45.186.143.0/24 | 256 | LACNIC | BR | 12th Nov 2019 |
| 45.188.59.0/24 | 256 | LACNIC | BR | 12th Nov 2019 |
| 45.189.156.0/22 | 1k | LACNIC |  MX | 11th Dec 2019 |
| 45.191.112.0/22 | 1k | LACNIC | AR | 17th Feb 2020 |
| 45.208.0.0/14 | 262k | AFRINIC |  GH | 22nd Apr 2015 |
| 45.221.25.0/24 | 256 | AFRINIC |  MW | 17th Jan 2020 |
| 45.221.27.0/24 | 256 | AFRINIC |  CI | 28th Feb 2020 |
| 45.225.32.0/22 | 1k | LACNIC | BR | 18th Oct 2017 |
| 45.225.42.0/24 | 256 | LACNIC |  BZ | 17th Oct 2017 |
| 45.225.96.0/22 | 1k | LACNIC | AR | 18th Oct 2017 |
| 45.227.0.0/22 | 1k | LACNIC | BR | 9th Nov 2017 |
| 45.227.128.0/23 | 512 | LACNIC | AR | 7th Dec 2017 |
| 45.227.206.0/24 | 256 | LACNIC | BR | 29th Nov 2017 |
| 45.227.244.0/22 | 1k | LACNIC | AR | 29th Nov 2017 |
| 45.228.156.0/24 | 256 | LACNIC | BZ | 28th Dec 2017 |
| 45.228.202.0/24 | 256 | LACNIC | AR | 27th Dec 2017 |
| 45.228.212.0/22 | 1k | LACNIC | BR | 20th Dec 2017 |
| 45.228.232.0/24 | 256 | LACNIC |  GT | 9th Jan 2018 |
| 45.230.52.0/22 | 1k | LACNIC | BR | 29th Jan 2018 |
| 45.233.238.0/23 | 512 | LACNIC | BR | 29th Mar 2018 |
| 45.233.4.0/22 | 1k | LACNIC |  CO | 13th Apr 2018 |
| 45.233.72.0/22 | 1k | LACNIC | CO | 11th Apr 2018 |
| 45.235.126.0/23 | 512 | LACNIC | BR | 25th Apr 2018 |
| 45.236.56.0/22 | 1k | LACNIC | BR | 14th May 2018 |
| 45.236.60.0/22 | 1k | LACNIC | BR | 9th May 2018 |
| 45.237.204.0/22 | 1k | LACNIC | BR | 7th Jun 2018 |
| 45.239.106.0/24 | 256 | LACNIC | BR | 29th Aug 2018 |
| 45.248.100.0/22 | 1k | APNIC |  CN | 4th May 2016 |
| 45.248.104.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 45.248.128.0/22 | 1k | APNIC | CN | 5th May 2016 |
| 45.248.132.0/22 | 1k | APNIC | CN | 5th May 2016 |
| 45.248.140.0/22 | 1k | APNIC |  AU | 6th May 2016 |
| 45.248.152.0/22 | 1k | APNIC |  BD | 6th May 2016 |
| 45.248.180.0/22 | 1k | APNIC |  IN | 6th May 2016 |
| 45.248.20.0/22 | 1k | APNIC | IN | 2nd May 2016 |
| 45.248.208.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.212.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.216.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.220.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.224.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.228.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.232.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 45.248.236.0/22 | 1k | APNIC | CN | 9th May 2016 |