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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,968 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 139.16.0.0/16 | 65.5k | RIPE NCC |  DE | 1st Sept 1993 |
| 139.172.0.0/16 | 65.5k | ARIN |  US | 25th Mar 1990 |
| 139.176.0.0/16 | 65.5k | APNIC |  CN | 10th Mar 2011 |
| 139.177.112.0/24 | 256 | ARIN | US | 3rd Jun 2020 |
| 139.177.113.0/24 | 256 | ARIN | US | 26th Mar 1990 |
| 139.177.114.0/23 | 512 | ARIN | US | 26th Mar 1990 |
| 139.177.116.0/22 | 1k | ARIN | US | 26th Mar 1990 |
| 139.177.208.0/20 | 4.1k | ARIN | US | 26th Mar 1990 |
| 139.180.18.0/23 | 512 | ARIN | US | 19th Dec 2018 |
| 139.187.0.0/16 | 65.5k | ARIN | US | 29th Mar 1990 |
| 139.190.0.0/18 | 16.4k | APNIC |  PK | 10th Mar 2011 |
| 139.190.64.0/19 | 8.2k | APNIC | PK | 10th Mar 2011 |
| 139.190.96.0/19 | 8.2k | APNIC |  ID | 10th Mar 2011 |
| 139.21.0.0/16 | 65.5k | RIPE NCC | DE | 27th Mar 1993 |
| 139.22.0.0/16 | 65.5k | RIPE NCC | DE | 27th Mar 1993 |
| 139.25.0.0/16 | 65.5k | RIPE NCC | DE | 14th Apr 1993 |
| 139.28.128.0/22 | 1k | APNIC |  HK | 2nd Jan 2019 |
| 139.28.132.0/22 | 1k | RIPE NCC | HK | 2nd Jan 2019 |
| 139.28.164.0/22 | 1k | RIPE NCC |  BE | 3rd Jan 2019 |
| 139.46.0.0/16 | 65.5k | ARIN | US | 18th Jun 1990 |
| 139.49.0.0/16 | 65.5k | ARIN | US | 20th Jun 1990 |
| 139.5.128.0/22 | 1k | APNIC | CN | 22nd Mar 2016 |
| 139.5.160.0/22 | 1k | APNIC | CN | 28th Mar 2016 |
| 139.5.184.0/22 | 1k | APNIC |  BN | 29th Mar 2016 |
| 139.5.192.0/22 | 1k | APNIC | CN | 29th Mar 2016 |
| 139.5.204.0/22 | 1k | APNIC | CN | 30th Mar 2016 |
| 139.5.212.0/22 | 1k | APNIC | CN | 30th Mar 2016 |
| 139.5.216.0/22 | 1k | APNIC |  MN | 30th Mar 2016 |
| 139.5.244.0/22 | 1k | APNIC | CN | 30th Mar 2016 |
| 139.5.56.0/22 | 1k | APNIC | CN | 3rd Mar 2016 |
| 139.5.80.0/22 | 1k | APNIC | CN | 16th Mar 2016 |
| 139.5.92.0/22 | 1k | APNIC | CN | 17th Mar 2016 |
| 139.50.0.0/16 | 65.5k | RIPE NCC | DE | 20th Jun 1990 |
| 139.56.0.0/16 | 65.5k | ARIN | US | 1st Jun 2020 |
| 139.60.212.0/22 | 1k | ARIN | US | 10th Oct 2017 |
| 139.60.227.0/24 | 256 | ARIN | US | 20th Dec 2017 |
| 139.60.240.0/20 | 4.1k | ARIN | US | 7th Nov 2017 |
| 139.60.36.0/22 | 1k | ARIN | US | 9th Dec 2016 |
| 139.64.202.0/24 | 256 | ARIN | US | 8th Apr 2022 |
| 139.64.206.0/24 | 256 | ARIN | US | 29th Jun 2020 |
| 139.64.244.0/22 | 1k | ARIN |  CA | 1st Jul 2020 |
| 139.65.0.0/16 | 65.5k | ARIN | US | 4th Jul 1990 |
| 139.68.128.0/18 | 16.4k | ARIN | US | 7th Feb 1990 |
| 139.69.0.0/16 | 65.5k | ARIN | US | 7th Feb 1990 |
| 139.77.0.0/16 | 65.5k | ARIN | US | 9th Feb 1990 |
| 139.90.0.0/16 | 65.5k | RIPE NCC | BE | 12th Feb 1990 |
| 139.93.0.0/16 | 65.5k | ARIN | US | 27th Jul 2026 |
| 14.0.0.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 14.0.12.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 14.1.0.0/22 | 1k | APNIC | CN | 14th Apr 2011 |