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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,149 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.195.99.0/24 | 256 | ARIN |  US | 21st Jul 1992 |
| 192.196.1.0/24 | 256 | RIPE NCC |  FR | 10th Mar 2005 |
| 192.196.144.0/21 | 2k | RIPE NCC | FR | 10th Mar 2005 |
| 192.196.152.0/22 | 1k | RIPE NCC | FR | 10th Mar 2005 |
| 192.196.16.0/20 | 4.1k | RIPE NCC | FR | 10th Mar 2005 |
| 192.196.2.0/23 | 512 | RIPE NCC | FR | 10th Mar 2005 |
| 192.196.216.0/23 | 512 | ARIN | US | 21st Jun 2017 |
| 192.196.219.0/24 | 256 | ARIN | US | 18th May 2023 |
| 192.196.32.0/19 | 8.2k | RIPE NCC | FR | 10th Mar 2005 |
| 192.196.4.0/22 | 1k | RIPE NCC | FR | 10th Mar 2005 |
| 192.196.64.0/18 | 16.4k | RIPE NCC | FR | 10th Mar 2005 |
| 192.196.8.0/21 | 2k | RIPE NCC | FR | 10th Mar 2005 |
| 192.197.112.0/24 | 256 | ARIN |  CA | 19th Jul 1992 |
| 192.197.116.0/24 | 256 | ARIN | CA | 27th Nov 1992 |
| 192.197.117.0/24 | 256 | ARIN | CA | 27th Nov 1992 |
| 192.197.118.0/24 | 256 | ARIN | CA | 27th Nov 1992 |
| 192.197.119.0/24 | 256 | ARIN | CA | 27th Nov 1992 |
| 192.197.133.0/24 | 256 | ARIN | CA | 2nd Dec 1992 |
| 192.197.134.0/24 | 256 | ARIN | CA | 2nd Dec 1992 |
| 192.197.138.0/24 | 256 | ARIN | CA | 21st Sept 1993 |
| 192.197.139.0/24 | 256 | ARIN | CA | 17th Mar 1993 |
| 192.197.140.0/24 | 256 | ARIN | CA | 4th Dec 1992 |
| 192.197.141.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 192.197.143.0/24 | 256 | ARIN | CA | 30th Dec 1992 |
| 192.197.144.0/24 | 256 | ARIN | US | 2nd Nov 2018 |
| 192.197.149.0/24 | 256 | ARIN | CA | 11th Dec 1992 |
| 192.197.150.0/24 | 256 | ARIN | CA | 11th Dec 1992 |
| 192.197.155.0/24 | 256 | ARIN | CA | 11th Dec 1992 |
| 192.197.158.0/24 | 256 | ARIN | US | 14th Jan 1993 |
| 192.197.159.0/24 | 256 | ARIN | US | 14th Jan 1993 |
| 192.197.160.0/24 | 256 | ARIN | US | 14th Jan 1993 |
| 192.197.164.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.165.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.166.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.168.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.169.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.170.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.171.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.173.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.175.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.176.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.177.0/24 | 256 | ARIN | CA | 14th Jan 1993 |
| 192.197.179.0/24 | 256 | ARIN | CA | 29th Jan 1993 |
| 192.197.182.0/24 | 256 | ARIN | CA | 29th Jan 1993 |
| 192.197.185.0/24 | 256 | ARIN | CA | 29th Jan 1993 |
| 192.197.186.0/24 | 256 | ARIN | CA | 29th Jan 1993 |
| 192.197.187.0/24 | 256 | ARIN | CA | 29th Jan 1993 |
| 192.197.188.0/24 | 256 | ARIN | CA | 3rd Feb 1993 |
| 192.197.191.0/24 | 256 | ARIN | CA | 29th Jan 1993 |
| 192.197.192.0/24 | 256 | ARIN | CA | 29th Jan 1993 |