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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in Italy
945 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 192.146.174.0/24 | 256 | RIPE NCC |  IT | 3rd Feb 1992 |
| 192.146.175.0/24 | 256 | RIPE NCC | IT | 3rd Feb 1992 |
| 192.146.176.0/24 | 256 | RIPE NCC | IT | 3rd Feb 1992 |
| 192.146.177.0/24 | 256 | RIPE NCC | IT | 3rd Feb 1992 |
| 192.146.178.0/24 | 256 | RIPE NCC | IT | 3rd Feb 1992 |
| 192.146.179.0/24 | 256 | RIPE NCC | IT | 3rd Feb 1992 |
| 192.146.180.0/24 | 256 | RIPE NCC | IT | 3rd Feb 1992 |
| 192.146.181.0/24 | 256 | RIPE NCC | IT | 3rd Feb 1992 |
| 192.147.247.0/24 | 256 | RIPE NCC | IT | 25th Feb 1992 |
| 192.148.220.0/24 | 256 | RIPE NCC | IT | 4th Mar 1992 |
| 192.149.110.0/24 | 256 | RIPE NCC | IT | 6th Mar 1992 |
| 192.150.146.0/24 | 256 | RIPE NCC | IT | 16th Mar 1992 |
| 192.152.141.0/24 | 256 | RIPE NCC | IT | 20th May 1992 |
| 192.152.166.0/24 | 256 | RIPE NCC | IT | 22nd May 1992 |
| 192.157.185.0/24 | 256 | RIPE NCC | IT | 14th Feb 1995 |
| 192.159.77.0/24 | 256 | RIPE NCC | IT | 29th Apr 1992 |
| 192.160.160.0/24 | 256 | RIPE NCC | IT | 27th May 1992 |
| 192.160.27.0/24 | 256 | RIPE NCC | IT | 24th Apr 1992 |
| 192.160.37.0/24 | 256 | RIPE NCC | IT | 27th Apr 1992 |
| 192.189.154.0/24 | 256 | RIPE NCC | IT | 27th Jul 1992 |
| 192.195.110.0/24 | 256 | RIPE NCC | IT | 22nd Jul 1992 |
| 192.35.146.0/24 | 256 | RIPE NCC | IT | 15th Apr 1988 |
| 192.58.218.0/24 | 256 | RIPE NCC | IT | 25th Oct 1989 |
| 192.68.176.0/24 | 256 | RIPE NCC | IT | 15th Mar 1990 |
| 192.70.136.0/24 | 256 | RIPE NCC | IT | 26th Mar 1990 |
| 192.81.193.0/24 | 256 | RIPE NCC | IT | 10th Mar 2017 |
| 192.84.87.0/24 | 256 | RIPE NCC | IT | 26th Oct 1990 |
| 192.88.196.0/24 | 256 | RIPE NCC | IT | 20th Dec 1990 |
| 192.92.104.0/23 | 512 | RIPE NCC | IT | 23rd Jan 1991 |
| 193.104.137.0/24 | 256 | RIPE NCC | IT | 12th Nov 2009 |
| 193.109.233.0/24 | 256 | RIPE NCC | IT | 23rd Nov 2001 |
| 193.150.68.0/24 | 256 | RIPE NCC | IT | 1st Mar 2021 |
| 193.161.116.0/22 | 1k | RIPE NCC | IT | 18th Jul 2018 |
| 193.168.132.0/22 | 1k | RIPE NCC | IT | 11th Dec 2018 |
| 193.169.242.0/23 | 512 | RIPE NCC | IT | 13th Aug 2009 |
| 193.169.58.0/24 | 256 | RIPE NCC | IT | 12th Sept 2022 |
| 193.178.204.0/22 | 1k | RIPE NCC | IT | 7th Mar 2001 |
| 193.178.252.0/22 | 1k | RIPE NCC | IT | 26th Mar 2001 |
| 193.201.28.0/23 | 512 | RIPE NCC | IT | 4th Jun 2002 |
| 193.219.122.0/24 | 256 | RIPE NCC | IT | 16th Dec 2024 |
| 193.219.29.0/24 | 256 | RIPE NCC | IT | 2nd Jun 2005 |
| 193.254.24.0/23 | 512 | RIPE NCC | IT | 11th Jun 1999 |
| 193.254.26.0/24 | 256 | RIPE NCC | IT | 11th Jun 1999 |
| 193.28.95.0/24 | 256 | RIPE NCC | IT | 26th Apr 2004 |
| 193.33.242.0/23 | 512 | RIPE NCC | IT | 8th Oct 2019 |
| 193.33.252.0/23 | 512 | RIPE NCC | IT | 8th Oct 2019 |
| 193.41.205.0/24 | 256 | RIPE NCC | IT | 29th Dec 2000 |
| 193.42.13.0/24 | 256 | RIPE NCC | IT | 9th Dec 1993 |
| 193.42.133.0/24 | 256 | RIPE NCC | IT | 9th Mar 1994 |
| 193.42.140.0/23 | 512 | RIPE NCC | IT | 27th May 1994 |