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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 207.248.122.0/24 | 256 | LACNIC |  MX | 11th Jun 2011 |
| 207.248.70.0/24 | 256 | LACNIC | MX | 3rd Aug 2007 |
| 207.248.71.0/24 | 256 | LACNIC | MX | 3rd Aug 2007 |
| 207.248.72.0/23 | 512 | LACNIC | MX | 23rd Dec 1996 |
| 207.248.78.0/23 | 512 | LACNIC | MX | 5th Feb 1997 |
| 207.248.82.0/23 | 512 | LACNIC | MX | 31st Jan 1997 |
| 207.248.84.0/24 | 256 | LACNIC | MX | 31st Jan 1997 |
| 207.248.86.0/24 | 256 | LACNIC |  NI | 5th Sept 2016 |
| 207.248.88.0/22 | 1k | LACNIC | MX | 31st Dec 1996 |
| 207.249.192.0/19 | 8.2k | LACNIC | MX | 16th Feb 1998 |
| 207.251.240.0/20 | 4.1k | ARIN |  US | 15th Apr 2005 |
| 207.254.104.0/21 | 2k | ARIN | US | 1st Jun 2020 |
| 207.3.0.0/16 | 65.5k | ARIN | US | 13th Dec 1995 |
| 207.32.213.0/24 | 256 | ARIN | US | 4th Oct 2019 |
| 207.34.1.0/24 | 256 | ARIN |  CA | 1st Apr 1996 |
| 207.34.12.0/22 | 1k | ARIN | CA | 13th Jun 1996 |
| 207.34.16.0/21 | 2k | ARIN | CA | 13th Jun 1996 |
| 207.34.3.0/24 | 256 | ARIN | CA | 1st Apr 1996 |
| 207.34.4.0/24 | 256 | ARIN | CA | 1st Apr 1996 |
| 207.34.5.0/24 | 256 | ARIN | US | 25th Mar 2009 |
| 207.39.0.0/16 | 65.5k | ARIN | US | 31st Jan 1996 |
| 207.45.104.0/21 | 2k | ARIN | US | 11th Apr 1996 |
| 207.45.224.0/20 | 4.1k | ARIN | US | 2nd May 1996 |
| 207.45.48.0/21 | 2k | ARIN | US | 13th Feb 1996 |
| 207.45.56.0/21 | 2k | ARIN | US | 29th Feb 1996 |
| 207.45.96.0/21 | 2k | ARIN | US | 13th Mar 1996 |
| 207.47.56.0/24 | 256 | ARIN | US | 18th Jun 2004 |
| 207.51.0.0/16 | 65.5k | ARIN | US | 2nd Feb 1996 |
| 207.52.0.0/16 | 65.5k | ARIN | US | 13th Feb 1996 |
| 207.53.128.0/18 | 16.4k | ARIN | US | 20th Feb 1996 |
| 207.53.248.0/23 | 512 | ARIN | US | 6th Mar 2019 |
| 207.53.250.0/23 | 512 | ARIN | US | 20th Feb 2019 |
| 207.65.42.0/23 | 512 | ARIN | US | 15th Sept 2023 |
| 207.7.0.0/18 | 16.4k | ARIN | US | 21st Dec 1995 |
| 207.71.176.0/20 | 4.1k | ARIN | US | 20th Mar 1996 |
| 207.89.24.0/21 | 2k | ARIN | US | 18th Dec 2015 |
| 207.89.48.0/24 | 256 | ARIN | US | 20th Sept 2016 |
| 207.89.52.0/24 | 256 | ARIN | US | 5th Aug 2016 |
| 207.89.62.0/23 | 512 | ARIN | US | 11th Apr 2016 |
| 207.90.208.0/22 | 1k | ARIN | US | 7th Jan 2022 |
| 207.90.220.0/22 | 1k | ARIN | US | 7th Jan 2022 |
| 207.92.0.0/19 | 8.2k | ARIN | US | 5th Dec 2024 |
| 207.92.128.0/18 | 16.4k | ARIN | US | 5th Dec 2024 |
| 207.92.224.0/20 | 4.1k | ARIN | US | 5th Dec 2024 |
| 207.92.48.0/20 | 4.1k | ARIN | US | 27th Mar 1996 |
| 207.93.32.0/19 | 8.2k | ARIN | US | 27th Mar 1996 |
| 207.93.64.0/19 | 8.2k | ARIN | US | 5th Dec 2024 |
| 207.95.0.0/16 | 65.5k | ARIN | US | 27th Mar 1996 |
| 208.101.207.0/24 | 256 | ARIN | US | 15th Mar 2006 |
| 208.103.144.0/22 | 1k | ARIN | US | 17th Dec 2021 |