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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,124 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.108.96.0/24 | 256 | ARIN |  US | 6th May 1991 |
| 192.109.0.0/21 | 2k | RIPE NCC |  DE | 1st May 1991 |
| 192.109.107.0/24 | 256 | RIPE NCC | DE | 19th Mar 1993 |
| 192.109.110.0/24 | 256 | ARIN | US | 2nd Feb 2022 |
| 192.109.112.0/23 | 512 | RIPE NCC | DE | 22nd Mar 1994 |
| 192.109.114.0/24 | 256 | RIPE NCC | DE | 14th Apr 1994 |
| 192.109.118.0/24 | 256 | RIPE NCC | DE | 18th Jan 1994 |
| 192.109.119.0/24 | 256 | ARIN | US | 2nd Feb 2022 |
| 192.109.128.0/24 | 256 | RIPE NCC |  NL | 1st Sept 1993 |
| 192.109.137.0/24 | 256 | RIPE NCC | DE | 21st Jul 1992 |
| 192.109.148.0/24 | 256 | RIPE NCC |  FR | 1st Sept 1993 |
| 192.109.149.0/24 | 256 | ARIN | US | 18th Jan 2022 |
| 192.109.160.0/24 | 256 | RIPE NCC | DE | 22nd Jun 1993 |
| 192.109.161.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.162.0/24 | 256 | RIPE NCC | DE | 30th Apr 1993 |
| 192.109.163.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.164.0/24 | 256 | RIPE NCC | DE | 23rd Feb 1994 |
| 192.109.166.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.167.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.168.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.169.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.170.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.171.0/24 | 256 | RIPE NCC | DE | 16th Feb 1994 |
| 192.109.172.0/24 | 256 | RIPE NCC |  SI | 12th Nov 2019 |
| 192.109.173.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.174.0/24 | 256 | RIPE NCC | DE | 1st Sept 1993 |
| 192.109.176.0/24 | 256 | RIPE NCC | DE | 19th Mar 1993 |
| 192.109.178.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.179.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.18.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.180.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.181.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.182.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.183.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.189.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.191.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.192.0/23 | 512 | RIPE NCC | DE | 1st May 1991 |
| 192.109.194.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.196.0/24 | 256 | RIPE NCC | SI | 12th Nov 2019 |
| 192.109.20.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.203.0/24 | 256 | RIPE NCC | SI | 12th Nov 2019 |
| 192.109.204.0/24 | 256 | RIPE NCC |  BE | 1st May 1991 |
| 192.109.207.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.208.0/24 | 256 | RIPE NCC | SI | 12th Nov 2019 |
| 192.109.216.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.218.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.221.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.226.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.230.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |
| 192.109.237.0/24 | 256 | RIPE NCC | DE | 1st May 1991 |