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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
27,034 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 198.34.212.0/22 | 1k | ARIN | US | 13th Jul 2026 |
| 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 |
| 198.38.32.0/20 | 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 |
| 198.43.0.0/16 | 65.5k | ARIN | US | 6th Jan 1993 |
| 198.44.195.0/24 | 256 | ARIN | US | 10th Sept 2019 |
| 198.45.112.0/23 | 512 | ARIN | US | 17th Mar 1993 |
| 198.45.32.0/20 | 4.1k | ARIN | US | 8th Jan 1993 |
| 198.45.64.0/19 | 8.2k | ARIN | US | 17th Mar 1993 |
| 198.45.96.0/20 | 4.1k | ARIN | US | 17th Mar 1993 |
| 198.46.0.0/21 | 2k | ARIN | US | 12th Jan 1993 |
| 198.46.10.0/23 | 512 | ARIN | US | 1st Jul 2025 |
| 198.46.48.0/20 | 4.1k | ARIN | US | 2nd May 2012 |
| 198.47.0.0/22 | 1k | ARIN | US | 10th Mar 1993 |
| 198.47.30.0/24 | 256 | ARIN | US | 21st Jan 1993 |
| 198.47.4.0/22 | 1k | ARIN | US | 21st Jan 1993 |
| 198.47.89.0/24 | 256 | ARIN | US | 12th Aug 2013 |
| 198.48.16.0/20 | 4.1k | ARIN | US | 12th Jan 1993 |
| 198.48.4.0/22 | 1k | ARIN | US | 27th Jan 1993 |