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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,431 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 141.193.227.0/24 | 256 | ARIN |  US | 8th May 2019 |
| 141.193.232.0/24 | 256 | ARIN | US | 12th Feb 2019 |
| 141.193.25.0/24 | 256 | ARIN | US | 18th Jul 2017 |
| 141.193.26.0/24 | 256 | ARIN | US | 1st Sept 2017 |
| 141.193.70.0/24 | 256 | ARIN | US | 9th Jun 2021 |
| 141.204.0.0/16 | 65.5k | ARIN | US | 3rd Aug 1990 |
| 141.205.0.0/16 | 65.5k | ARIN | US | 3rd Aug 1990 |
| 141.206.0.0/17 | 32.8k | ARIN | US | 16th Oct 1992 |
| 141.206.128.0/20 | 4.1k | ARIN | US | 16th Oct 1992 |
| 141.206.160.0/19 | 8.2k | ARIN | US | 16th Oct 1992 |
| 141.224.112.0/20 | 4.1k | ARIN | US | 14th Jun 2024 |
| 141.226.138.0/24 | 256 | ARIN | US | 6th Jul 2017 |
| 141.240.0.0/16 | 65.5k | ARIN | US | 10th Aug 1990 |
| 141.247.0.0/16 | 65.5k | ARIN | US | 21st Jun 1994 |
| 141.251.0.0/16 | 65.5k | ARIN | US | 22nd Jun 2011 |
| 142.0.16.0/20 | 4.1k | ARIN |  CA | 29th May 2012 |
| 142.0.224.0/20 | 4.1k | ARIN |  JM | 8th Jan 2024 |
| 142.0.68.0/22 | 1k | ARIN | US | 26th Jun 2024 |
| 142.10.0.0/16 | 65.5k | ARIN | CA | 30th Nov 1990 |
| 142.101.0.0/16 | 65.5k | ARIN | CA | 27th Jan 1992 |
| 142.102.0.0/16 | 65.5k | ARIN | CA | 27th Jan 1992 |
| 142.11.128.0/18 | 16.4k | ARIN | US | 19th Jun 2012 |
| 142.11.64.0/18 | 16.4k | ARIN | US | 19th Jun 2012 |
| 142.128.0.0/16 | 65.5k | ARIN | CA | 4th Mar 1992 |
| 142.130.0.0/16 | 65.5k | ARIN | CA | 8th Apr 1993 |
| 142.135.0.0/16 | 65.5k | ARIN | CA | 23rd Apr 1992 |
| 142.138.0.0/16 | 65.5k | ARIN | CA | 13th May 1992 |
| 142.147.100.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.14.0/24 | 256 | ARIN | US | 24th Aug 2015 |
| 142.147.15.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.50.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.66.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.74.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.78.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.147.80.0/24 | 256 | ARIN | CA | 5th Jun 2014 |
| 142.148.0.0/17 | 32.8k | ARIN | CA | 19th Jun 1992 |
| 142.154.227.0/24 | 256 | ARIN | CA | 23rd Jul 1992 |
| 142.154.228.0/22 | 1k | ARIN | CA | 23rd Jul 1992 |
| 142.157.0.0/16 | 65.5k | ARIN | CA | 24th Jul 1992 |
| 142.168.0.0/16 | 65.5k | ARIN | CA | 18th Oct 1993 |
| 142.174.0.0/16 | 65.5k | ARIN | CA | 26th Aug 1992 |
| 142.175.0.0/16 | 65.5k | ARIN | CA | 26th Aug 1992 |
| 142.178.0.0/16 | 65.5k | ARIN | CA | 26th Aug 1992 |
| 142.193.0.0/16 | 65.5k | ARIN | CA | 18th Jan 1994 |
| 142.196.0.0/15 | 131k | ARIN | US | 8th May 2012 |
| 142.2.0.0/16 | 65.5k | ARIN | CA | 21st Sept 1990 |
| 142.202.106.0/24 | 256 | ARIN | US | 20th Dec 2019 |
| 142.202.12.0/22 | 1k | ARIN | CA | 18th Dec 2019 |
| 142.202.156.0/24 | 256 | ARIN | US | 21st Jan 2020 |
| 142.202.159.0/24 | 256 | ARIN | US | 8th Jan 2020 |