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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 United States
27,019 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 193.254.198.0/23 | 512 | RIPE NCC |  US | 22nd Aug 2002 |
| 193.28.106.0/24 | 256 | RIPE NCC | US | 13th Nov 2019 |
| 193.28.57.0/24 | 256 | RIPE NCC | US | 13th Nov 2019 |
| 193.28.60.0/24 | 256 | RIPE NCC | US | 13th Nov 2019 |
| 193.28.93.0/24 | 256 | RIPE NCC | US | 13th Nov 2019 |
| 193.3.54.0/24 | 256 | RIPE NCC | US | 25th Mar 2021 |
| 193.30.88.0/24 | 256 | ARIN | US | 19th Apr 2022 |
| 193.32.118.0/23 | 512 | RIPE NCC | US | 21st Oct 1992 |
| 193.32.120.0/22 | 1k | RIPE NCC | US | 21st Oct 1992 |
| 193.32.124.0/23 | 512 | RIPE NCC | US | 21st Oct 1992 |
| 193.32.31.0/24 | 256 | RIPE NCC | US | 27th Aug 1992 |
| 193.32.32.0/24 | 256 | RIPE NCC | US | 27th Aug 1992 |
| 193.32.33.0/24 | 256 | RIPE NCC | US | 27th Aug 1992 |
| 193.32.35.0/24 | 256 | RIPE NCC | US | 27th Aug 1992 |
| 193.37.104.0/22 | 1k | RIPE NCC | US | 27th Apr 1993 |
| 193.37.96.0/21 | 2k | RIPE NCC | US | 27th Apr 1993 |
| 193.39.228.0/22 | 1k | RIPE NCC | US | 6th Oct 1993 |
| 193.39.232.0/21 | 2k | RIPE NCC | US | 6th Oct 1993 |
| 193.41.248.0/24 | 256 | RIPE NCC | US | 5th Jan 2001 |
| 193.41.250.0/24 | 256 | RIPE NCC | US | 5th Jan 2001 |
| 193.46.90.0/24 | 256 | RIPE NCC | US | 27th Nov 2023 |
| 193.57.182.0/23 | 512 | RIPE NCC | US | 5th Jul 1994 |
| 194.121.49.0/24 | 256 | RIPE NCC | US | 31st Jul 1995 |
| 194.164.105.0/24 | 256 | ARIN | US | 29th Jan 2024 |
| 194.164.128.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.184.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.208.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.164.40.0/21 | 2k | ARIN | US | 16th May 2024 |
| 194.179.146.0/23 | 512 | ARIN | US | 9th Dec 2024 |
| 194.26.194.0/24 | 256 | ARIN | US | 13th Feb 2024 |
| 194.32.244.0/22 | 1k | RIPE NCC | US | 29th Oct 2018 |
| 194.33.149.0/24 | 256 | ARIN | US | 18th Jan 2022 |
| 194.39.245.0/24 | 256 | RIPE NCC | US | 4th Jul 2024 |
| 194.41.63.0/24 | 256 | RIPE NCC | US | 3rd Jan 1995 |
| 194.45.182.0/23 | 512 | RIPE NCC | US | 28th Feb 1994 |
| 194.5.86.0/24 | 256 | RIPE NCC | US | 20th Nov 2019 |
| 194.53.48.0/22 | 1k | RIPE NCC | US | 30th Jul 2018 |
| 194.62.176.0/22 | 1k | RIPE NCC | US | 29th Nov 1994 |
| 194.77.64.0/24 | 256 | RIPE NCC | US | 16th Oct 1995 |
| 194.8.49.0/24 | 256 | RIPE NCC | US | 14th Oct 2003 |
| 194.9.240.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.241.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.243.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.246.0/23 | 512 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.248.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.249.0/24 | 256 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.250.0/23 | 512 | RIPE NCC | US | 2nd Nov 1999 |
| 194.9.252.0/22 | 1k | RIPE NCC | US | 2nd Nov 1999 |
| 194.93.192.0/18 | 16.4k | RIPE NCC | US | 20th Oct 1994 |
| 195.13.44.0/23 | 512 | RIPE NCC | US | 1st Nov 2019 |