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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.96.218.0/24 | 256 | ARIN |  CA | 28th Oct 1993 |
| 198.96.219.0/24 | 256 | ARIN | CA | 28th Oct 1993 |
| 198.96.221.0/24 | 256 | ARIN |  US | 25th Feb 2014 |
| 198.96.224.0/20 | 4.1k | ARIN | CA | 6th Oct 1993 |
| 198.96.23.0/24 | 256 | ARIN | CA | 18th Aug 1994 |
| 198.96.24.0/22 | 1k | ARIN | CA | 31st Aug 1993 |
| 198.96.240.0/24 | 256 | ARIN | US | 18th Oct 1993 |
| 198.96.242.0/24 | 256 | ARIN | US | 8th Oct 2019 |
| 198.96.243.0/24 | 256 | ARIN | US | 26th Feb 2014 |
| 198.96.244.0/24 | 256 | ARIN | US | 18th Oct 1993 |
| 198.96.245.0/24 | 256 | ARIN | US | 18th Oct 1993 |
| 198.96.248.0/21 | 2k | ARIN | CA | 11th Mar 1993 |
| 198.96.28.0/24 | 256 | ARIN | CA | 31st Aug 1993 |
| 198.96.30.0/23 | 512 | ARIN | CA | 10th Sept 1993 |
| 198.96.4.0/24 | 256 | ARIN | US | 24th Feb 2014 |
| 198.96.40.0/22 | 1k | ARIN | CA | 13th Jul 1993 |
| 198.96.48.0/21 | 2k | ARIN | CA | 13th Jul 1993 |
| 198.96.5.0/24 | 256 | ARIN | US | 24th Feb 2014 |
| 198.96.56.0/22 | 1k | ARIN | CA | 13th Jul 1993 |
| 198.96.6.0/24 | 256 | ARIN | CA | 6th Jul 1993 |
| 198.96.60.0/24 | 256 | ARIN | CA | 13th Jul 1993 |
| 198.96.61.0/24 | 256 | ARIN | CA | 6th Oct 1993 |
| 198.96.64.0/21 | 2k | ARIN | CA | 11th Mar 1993 |
| 198.96.7.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.96.72.0/22 | 1k | ARIN | CA | 11th Mar 1993 |
| 198.96.8.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.96.9.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.97.0.0/22 | 1k | ARIN | US | 11th Mar 1993 |
| 198.97.12.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.16.0/21 | 2k | ARIN | US | 12th Mar 1993 |
| 198.97.216.0/21 | 2k | ARIN | US | 16th Apr 2013 |
| 198.97.237.0/24 | 256 | ARIN | CA | 17th Dec 2013 |
| 198.97.238.0/23 | 512 | ARIN | US | 28th Feb 2014 |
| 198.97.24.0/22 | 1k | ARIN | US | 12th Mar 1993 |
| 198.97.28.0/23 | 512 | ARIN | US | 12th Mar 1993 |
| 198.97.32.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.33.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.34.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.35.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.36.0/24 | 256 | ARIN | US | 11th Mar 1993 |
| 198.97.37.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 198.97.39.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 198.97.40.0/24 | 256 | ARIN | US | 12th Mar 1993 |
| 198.97.45.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.47.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.48.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.49.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.50.0/24 | 256 | ARIN | US | 17th Mar 1993 |
| 198.97.54.0/24 | 256 | ARIN | US | 18th Mar 1993 |
| 198.97.55.0/24 | 256 | ARIN | US | 18th Mar 1993 |