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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 Austria
554 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 185.57.176.0/22 | 1k | RIPE NCC |  AT | 14th May 2014 |
| 185.63.248.0/22 | 1k | RIPE NCC | AT | 15th Jul 2014 |
| 185.70.228.0/22 | 1k | RIPE NCC | AT | 22nd Sept 2014 |
| 185.80.89.0/24 | 256 | RIPE NCC | AT | 7th Mar 2023 |
| 185.81.204.0/24 | 256 | RIPE NCC | AT | 18th Dec 2014 |
| 185.91.144.0/22 | 1k | RIPE NCC | AT | 12th Mar 2015 |
| 185.93.8.0/22 | 1k | RIPE NCC | AT | 20th Mar 2015 |
| 185.96.100.0/22 | 1k | RIPE NCC | AT | 16th Apr 2015 |
| 185.99.72.0/22 | 1k | RIPE NCC | AT | 7th May 2015 |
| 188.116.18.0/23 | 512 | RIPE NCC | AT | 29th May 2009 |
| 188.116.48.0/23 | 512 | RIPE NCC | AT | 29th May 2009 |
| 188.241.124.0/23 | 512 | RIPE NCC | AT | 23rd Jun 2009 |
| 188.92.31.0/24 | 256 | RIPE NCC | AT | 9th Jan 2024 |
| 188.93.248.0/21 | 2k | RIPE NCC | AT | 25th May 2009 |
| 192.100.23.0/24 | 256 | RIPE NCC | AT | 18th Mar 1991 |
| 192.100.24.0/24 | 256 | RIPE NCC | AT | 18th Mar 1991 |
| 192.100.25.0/24 | 256 | RIPE NCC | AT | 18th Mar 1991 |
| 192.102.1.0/24 | 256 | RIPE NCC | AT | 8th Mar 1991 |
| 192.107.233.0/24 | 256 | RIPE NCC | AT | 4th Jun 1991 |
| 192.108.121.0/24 | 256 | RIPE NCC | AT | 24th Jul 1991 |
| 192.108.238.0/24 | 256 | RIPE NCC | AT | 5th Aug 1991 |
| 192.111.252.0/24 | 256 | RIPE NCC | AT | 27th Aug 1991 |
| 192.112.61.0/24 | 256 | RIPE NCC | AT | 30th Jul 1991 |
| 192.124.155.0/24 | 256 | RIPE NCC | AT | 23rd Sept 1991 |
| 192.129.80.0/24 | 256 | RIPE NCC | AT | 24th Sept 1991 |
| 192.135.133.0/24 | 256 | RIPE NCC | AT | 11th Dec 1991 |
| 192.146.132.0/24 | 256 | RIPE NCC | AT | 28th Jan 1992 |
| 192.149.27.0/24 | 256 | RIPE NCC | AT | 25th Feb 1992 |
| 192.150.203.0/24 | 256 | RIPE NCC | AT | 19th Mar 1992 |
| 192.152.254.0/24 | 256 | RIPE NCC | AT | 12th Jun 1992 |
| 192.152.63.0/24 | 256 | RIPE NCC | AT | 8th Apr 1992 |
| 192.153.176.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.178.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.179.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.180.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.181.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.153.182.0/24 | 256 | RIPE NCC | AT | 6th Apr 1992 |
| 192.157.165.0/24 | 256 | RIPE NCC | AT | 14th Feb 1995 |
| 192.157.166.0/23 | 512 | RIPE NCC | AT | 14th Feb 1995 |
| 192.157.168.0/24 | 256 | RIPE NCC | AT | 14th Feb 1995 |
| 192.160.231.0/24 | 256 | RIPE NCC | AT | 11th Jun 1992 |
| 192.160.232.0/24 | 256 | RIPE NCC | AT | 11th Jun 1992 |
| 192.160.67.0/24 | 256 | RIPE NCC | AT | 12th May 1992 |
| 192.164.168.0/22 | 1k | RIPE NCC | AT | 1st Sept 1993 |
| 192.164.36.0/23 | 512 | RIPE NCC | AT | 1st Sept 1993 |
| 192.166.242.0/23 | 512 | RIPE NCC | AT | 6th Jul 2018 |
| 192.231.67.0/24 | 256 | RIPE NCC | AT | 30th Sept 1992 |
| 192.35.244.0/24 | 256 | RIPE NCC | AT | 17th May 1990 |
| 192.64.28.0/24 | 256 | RIPE NCC | AT | 13th Jan 1994 |
| 192.68.4.0/24 | 256 | RIPE NCC | AT | 8th Dec 1992 |