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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,279 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.232.230.0/24 | 256 | ARIN |  US | 18th Nov 1993 |
| 198.232.232.0/23 | 512 | ARIN | US | 18th Nov 1993 |
| 198.232.234.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.232.235.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.240.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.241.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.242.0/24 | 256 | ARIN | US | 19th Nov 2012 |
| 198.232.243.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.244.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.245.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.246.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.248.0/24 | 256 | ARIN | US | 22nd Nov 1993 |
| 198.232.8.0/21 | 2k | ARIN | US | 28th Jul 1993 |
| 198.235.1.0/24 | 256 | ARIN |  CA | 6th Aug 1993 |
| 198.235.10.0/24 | 256 | ARIN | CA | 12th Aug 1993 |
| 198.235.11.0/24 | 256 | ARIN | CA | 8th Nov 1993 |
| 198.235.129.0/24 | 256 | ARIN | CA | 22nd Nov 1993 |
| 198.235.136.0/24 | 256 | ARIN | CA | 27th Oct 1993 |
| 198.235.144.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.235.145.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.235.146.0/23 | 512 | ARIN | CA | 6th Dec 1993 |
| 198.235.148.0/23 | 512 | ARIN | CA | 6th Dec 1993 |
| 198.235.150.0/23 | 512 | ARIN | CA | 18th Nov 1993 |
| 198.235.152.0/23 | 512 | ARIN | CA | 18th Nov 1993 |
| 198.235.154.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 198.235.160.0/20 | 4.1k | ARIN | CA | 5th Aug 1993 |
| 198.235.176.0/24 | 256 | ARIN | CA | 9th Aug 1993 |
| 198.235.178.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.235.179.0/24 | 256 | ARIN | US | 16th Aug 1993 |
| 198.235.184.0/24 | 256 | ARIN | CA | 19th Aug 1993 |
| 198.235.185.0/24 | 256 | ARIN | CA | 21st Oct 1993 |
| 198.235.186.0/23 | 512 | ARIN | CA | 27th Jul 1993 |
| 198.235.188.0/22 | 1k | ARIN | CA | 27th Jul 1993 |
| 198.235.192.0/23 | 512 | ARIN | CA | 27th Jul 1993 |
| 198.235.194.0/23 | 512 | ARIN | CA | 27th Jul 1993 |
| 198.235.196.0/24 | 256 | ARIN | CA | 27th Jul 1993 |
| 198.235.197.0/24 | 256 | ARIN | CA | 8th Nov 1993 |
| 198.235.2.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 198.235.20.0/22 | 1k | ARIN | US | 23rd Jul 2025 |
| 198.235.203.0/24 | 256 | ARIN | US | 6th Apr 2026 |
| 198.235.204.0/23 | 512 | ARIN | US | 12th Oct 2012 |
| 198.235.206.0/23 | 512 | ARIN | CA | 4th Nov 1993 |
| 198.235.220.0/22 | 1k | ARIN | CA | 8th Nov 1993 |
| 198.235.224.0/21 | 2k | ARIN | CA | 8th Nov 1993 |
| 198.235.232.0/22 | 1k | ARIN | CA | 8th Nov 1993 |
| 198.235.236.0/24 | 256 | ARIN | CA | 9th Nov 1993 |
| 198.235.237.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.235.238.0/23 | 512 | ARIN | CA | 17th Nov 1993 |
| 198.235.240.0/21 | 2k | ARIN | CA | 17th Nov 1993 |
| 198.235.248.0/22 | 1k | ARIN | CA | 17th Nov 1993 |