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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.90.72.0/24 | 256 | ARIN |  US | 31st Mar 1993 |
| 198.90.74.0/23 | 512 | ARIN | US | 13th Feb 2014 |
| 198.91.14.0/23 | 512 | ARIN | US | 13th Feb 2014 |
| 198.91.16.0/22 | 1k | ARIN | US | 5th Mar 1993 |
| 198.91.20.0/24 | 256 | ARIN | US | 5th Mar 1993 |
| 198.91.21.0/24 | 256 | ARIN | US | 5th Dec 2013 |
| 198.91.4.0/22 | 1k | ARIN | US | 5th Mar 1993 |
| 198.91.40.0/24 | 256 | ARIN | US | 30th Jun 2026 |
| 198.91.44.0/22 | 1k | ARIN | US | 28th Sept 2018 |
| 198.91.76.0/22 | 1k | ARIN | US | 11th Mar 2013 |
| 198.96.1.0/24 | 256 | ARIN |  CA | 26th Jul 1993 |
| 198.96.10.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.96.11.0/24 | 256 | ARIN | CA | 14th Jun 1993 |
| 198.96.112.0/24 | 256 | ARIN | CA | 25th Jul 1994 |
| 198.96.116.0/24 | 256 | ARIN | CA | 7th Dec 1993 |
| 198.96.12.0/22 | 1k | ARIN | CA | 18th Jun 1993 |
| 198.96.120.0/24 | 256 | ARIN | CA | 16th Jul 1993 |
| 198.96.121.0/24 | 256 | ARIN | CA | 16th Jul 1993 |
| 198.96.122.0/23 | 512 | ARIN | CA | 19th Jul 1993 |
| 198.96.124.0/23 | 512 | ARIN | CA | 19th Jul 1993 |
| 198.96.126.0/24 | 256 | ARIN | CA | 19th Jul 1993 |
| 198.96.127.0/24 | 256 | ARIN | CA | 8th Nov 1993 |
| 198.96.144.0/24 | 256 | ARIN | CA | 21st Jul 1993 |
| 198.96.145.0/24 | 256 | ARIN | CA | 15th Dec 1993 |
| 198.96.146.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.147.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.148.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.149.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.150.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.151.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.152.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.153.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.96.156.0/22 | 1k | ARIN | CA | 1st Sept 1993 |
| 198.96.16.0/23 | 512 | ARIN | CA | 18th Jun 1993 |
| 198.96.160.0/21 | 2k | ARIN | CA | 1st Sept 1993 |
| 198.96.172.0/24 | 256 | ARIN | US | 9th Sept 1993 |
| 198.96.173.0/24 | 256 | ARIN | CA | 9th Sept 1993 |
| 198.96.184.0/24 | 256 | ARIN | CA | 10th Sept 1993 |
| 198.96.188.0/24 | 256 | ARIN | CA | 6th Oct 1993 |
| 198.96.190.0/24 | 256 | ARIN | CA | 2nd Nov 1993 |
| 198.96.191.0/24 | 256 | ARIN | CA | 3rd Feb 1994 |
| 198.96.192.0/21 | 2k | ARIN | CA | 14th Sept 1993 |
| 198.96.20.0/24 | 256 | ARIN | CA | 7th Jul 1993 |
| 198.96.200.0/21 | 2k | ARIN | CA | 8th Oct 1993 |
| 198.96.208.0/23 | 512 | ARIN | CA | 8th Oct 1993 |
| 198.96.21.0/24 | 256 | ARIN | CA | 7th Jul 1993 |
| 198.96.211.0/24 | 256 | ARIN | CA | 13th Oct 1993 |
| 198.96.214.0/24 | 256 | ARIN | US | 26th Oct 1993 |
| 198.96.216.0/24 | 256 | ARIN | CA | 28th Oct 1993 |
| 198.96.217.0/24 | 256 | ARIN | CA | 28th Oct 1993 |