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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 43.255.208.0/22 | 1k | APNIC |  CN | 7th Aug 2014 |
| 43.255.232.0/22 | 1k | APNIC | CN | 7th Aug 2014 |
| 43.255.244.0/22 | 1k | APNIC | CN | 8th Aug 2014 |
| 43.255.248.0/22 | 1k | APNIC |  KR | 8th Aug 2014 |
| 43.255.4.0/22 | 1k | APNIC | CN | 29th Jul 2014 |
| 43.255.48.0/22 | 1k | APNIC | CN | 30th Jul 2014 |
| 43.255.64.0/22 | 1k | APNIC | CN | 31st Jul 2014 |
| 43.255.72.0/22 | 1k | APNIC | CN | 31st Jul 2014 |
| 43.255.76.0/22 | 1k | APNIC | CN | 31st Jul 2014 |
| 43.255.8.0/22 | 1k | APNIC | CN | 29th Jul 2014 |
| 43.255.88.0/22 | 1k | APNIC |  TW | 31st Jul 2014 |
| 43.255.92.0/22 | 1k | APNIC | TW | 31st Jul 2014 |
| 45.0.0.0/15 | 131k | ARIN |  US | 9th Sept 1991 |
| 45.10.116.0/22 | 1k | RIPE NCC |  NL | 25th Apr 2019 |
| 45.10.216.0/22 | 1k | RIPE NCC |  RU | 25th Apr 2019 |
| 45.10.76.0/22 | 1k | RIPE NCC |  GB | 24th Apr 2019 |
| 45.10.8.0/22 | 1k | RIPE NCC |  FR | 23rd Apr 2019 |
| 45.11.120.0/22 | 1k | RIPE NCC |  PL | 26th Apr 2019 |
| 45.11.144.0/22 | 1k | RIPE NCC |  GG | 29th Apr 2019 |
| 45.11.197.0/24 | 256 | RIPE NCC | FR | 25th Jan 2022 |
| 45.11.208.0/22 | 1k | RIPE NCC | FR | 29th Apr 2019 |
| 45.11.244.0/22 | 1k | RIPE NCC | US | 30th Apr 2019 |
| 45.11.28.0/22 | 1k | RIPE NCC | NL | 26th Apr 2019 |
| 45.11.94.0/24 | 256 | RIPE NCC | RU | 26th Apr 2019 |
| 45.112.132.0/22 | 1k | APNIC | CN | 2nd Mar 2015 |
| 45.112.188.0/22 | 1k | APNIC | CN | 4th Mar 2015 |
| 45.112.208.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.212.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.216.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.220.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.228.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.236.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 45.112.80.0/23 | 512 | APNIC |  SG | 26th Feb 2015 |
| 45.112.82.0/23 | 512 | APNIC |  PH | 13th Mar 2015 |
| 45.113.116.0/22 | 1k | APNIC |  JP | 18th Mar 2015 |
| 45.113.12.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 45.113.128.0/22 | 1k | APNIC | SG | 20th Mar 2015 |
| 45.113.140.0/22 | 1k | APNIC |  HK | 20th Mar 2015 |
| 45.113.144.0/22 | 1k | APNIC | CN | 20th Mar 2015 |
| 45.113.148.0/22 | 1k | APNIC | CN | 20th Mar 2015 |
| 45.113.156.0/22 | 1k | APNIC | TW | 20th Mar 2015 |
| 45.113.16.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 45.113.168.0/22 | 1k | APNIC | CN | 23rd Mar 2015 |
| 45.113.176.0/22 | 1k | APNIC | CN | 23rd Mar 2015 |
| 45.113.180.0/22 | 1k | APNIC |  IN | 23rd Mar 2015 |
| 45.113.184.0/22 | 1k | APNIC | CN | 23rd Mar 2015 |
| 45.113.208.0/22 | 1k | APNIC | CN | 24th Mar 2015 |
| 45.113.212.0/22 | 1k | APNIC | CN | 24th Mar 2015 |
| 45.113.216.0/22 | 1k | APNIC | CN | 24th Mar 2015 |
| 45.113.220.0/22 | 1k | APNIC | CN | 24th Mar 2015 |