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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,256 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.32.175.0/24 | 256 | ARIN |  US | 9th Dec 2009 |
| 198.32.181.0/24 | 256 | ARIN | US | 9th Dec 2009 |
| 198.32.182.0/23 | 512 | ARIN | US | 9th Dec 2009 |
| 198.32.186.0/24 | 256 | ARIN | US | 19th May 2011 |
| 198.32.190.0/23 | 512 | ARIN | US | 9th Dec 2009 |
| 198.32.192.0/24 | 256 | ARIN | US | 9th Dec 2009 |
| 198.32.194.0/24 | 256 | ARIN | US | 16th Mar 2017 |
| 198.32.196.0/24 | 256 | ARIN | US | 26th Jan 2011 |
| 198.32.241.0/24 | 256 | ARIN | US | 9th Dec 2009 |
| 198.32.242.0/23 | 512 | ARIN | US | 9th Dec 2009 |
| 198.32.96.0/23 | 512 | ARIN | US | 16th Mar 2017 |
| 198.32.98.0/24 | 256 | ARIN | US | 16th Mar 2017 |
| 198.32.99.0/24 | 256 | ARIN | US | 9th Dec 2009 |
| 198.34.208.0/23 | 512 | ARIN |  CA | 23rd Dec 1992 |
| 198.34.212.0/22 | 1k | ARIN | US | 13th Jul 2026 |
| 198.34.216.0/21 | 2k | ARIN | CA | 23rd Dec 1992 |
| 198.34.224.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |
| 198.34.232.0/21 | 2k | ARIN | CA | 23rd Dec 1992 |
| 198.34.240.0/22 | 1k | ARIN | CA | 23rd Dec 1992 |
| 198.34.246.0/23 | 512 | ARIN | CA | 23rd Dec 1992 |
| 198.34.248.0/21 | 2k | ARIN | CA | 23rd Dec 1992 |
| 198.34.64.0/19 | 8.2k | ARIN | CA | 23rd Dec 1992 |
| 198.35.112.0/23 | 512 | ARIN | US | 14th Jan 1993 |
| 198.35.128.0/17 | 32.8k | ARIN | US | 21st Jan 1993 |
| 198.35.20.0/22 | 1k | ARIN | US | 28th Feb 2017 |
| 198.36.112.0/23 | 512 | ARIN | US | 14th Jan 1993 |
| 198.36.64.0/21 | 2k | ARIN | US | 14th Jan 1993 |
| 198.36.8.0/22 | 1k | ARIN | US | 30th Dec 1992 |
| 198.37.0.0/22 | 1k | ARIN | US | 30th Dec 1992 |
| 198.37.133.0/24 | 256 | ARIN | US | 2nd Aug 2013 |
| 198.37.32.0/21 | 2k | ARIN | US | 4th Feb 1993 |
| 198.37.40.0/22 | 1k | ARIN | US | 4th Feb 1993 |
| 198.37.44.0/23 | 512 | ARIN | US | 4th Feb 1993 |
| 198.37.46.0/24 | 256 | ARIN | US | 4th Feb 1993 |
| 198.37.64.0/20 | 4.1k | ARIN | US | 26th Jan 1993 |
| 198.37.7.0/24 | 256 | ARIN | US | 26th Oct 2012 |
| 198.37.80.0/21 | 2k | ARIN | US | 26th Jan 1993 |
| 198.37.88.0/22 | 1k | ARIN | US | 26th Jan 1993 |
| 198.37.92.0/23 | 512 | ARIN | US | 26th Jan 1993 |
| 198.38.0.0/22 | 1k | ARIN | CA | 10th Mar 2026 |
| 198.38.13.0/24 | 256 | ARIN | CA | 7th Jul 2020 |
| 198.38.32.0/20 | 4.1k | ARIN | US | 8th Feb 1993 |
| 198.38.64.0/21 | 2k | ARIN | US | 24th Apr 2025 |
| 198.38.72.0/23 | 512 | ARIN | US | 6th Apr 1993 |
| 198.40.128.0/18 | 16.4k | ARIN | US | 4th Jan 1993 |
| 198.40.192.0/19 | 8.2k | ARIN | US | 4th Jan 1993 |
| 198.40.32.0/21 | 2k | ARIN | US | 6th Jan 1993 |
| 198.40.8.0/21 | 2k | ARIN | US | 12th Jan 1993 |
| 198.41.4.0/22 | 1k | ARIN | US | 13th Jan 1993 |
| 198.42.0.0/16 | 65.5k | ARIN | US | 5th Jan 1993 |