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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.160.230.0/24 | 256 | ARIN |  US | 10th Sept 1993 |
| 198.160.231.0/24 | 256 | ARIN | US | 10th Sept 1993 |
| 198.160.232.0/22 | 1k | ARIN | US | 10th Sept 1993 |
| 198.160.236.0/24 | 256 | ARIN | US | 10th Sept 1993 |
| 198.160.237.0/24 | 256 | ARIN | US | 30th Apr 2013 |
| 198.160.24.0/23 | 512 | ARIN | US | 4th May 1993 |
| 198.160.244.0/24 | 256 | ARIN | US | 10th Sept 1993 |
| 198.160.246.0/24 | 256 | ARIN | US | 10th Sept 1993 |
| 198.160.247.0/24 | 256 | ARIN | US | 10th Sept 1993 |
| 198.160.251.0/24 | 256 | ARIN | US | 13th Sept 1993 |
| 198.160.254.0/24 | 256 | ARIN | US | 14th Sept 1993 |
| 198.160.4.0/24 | 256 | ARIN | US | 4th May 1993 |
| 198.161.0.0/24 | 256 | ARIN | US | 3rd May 2013 |
| 198.161.1.0/24 | 256 | ARIN |  CA | 19th May 1993 |
| 198.161.118.0/24 | 256 | ARIN | CA | 24th Jan 1994 |
| 198.161.124.0/24 | 256 | ARIN | CA | 7th Feb 1994 |
| 198.161.125.0/24 | 256 | ARIN | CA | 25th Feb 1994 |
| 198.161.126.0/24 | 256 | ARIN | CA | 22nd Mar 1994 |
| 198.161.128.0/22 | 1k | ARIN | CA | 8th Mar 1994 |
| 198.161.14.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.15.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.152.0/21 | 2k | ARIN | CA | 15th Feb 1994 |
| 198.161.16.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.160.0/22 | 1k | ARIN | CA | 15th Feb 1994 |
| 198.161.164.0/24 | 256 | ARIN | CA | 18th Feb 1994 |
| 198.161.17.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.172.0/22 | 1k | ARIN | CA | 31st Jan 1994 |
| 198.161.176.0/22 | 1k | ARIN | CA | 31st Jan 1994 |
| 198.161.180.0/24 | 256 | ARIN | CA | 12th Oct 1993 |
| 198.161.181.0/24 | 256 | ARIN | CA | 23rd Dec 1993 |
| 198.161.184.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.185.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.186.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.187.0/24 | 256 | ARIN | CA | 18th Oct 1993 |
| 198.161.188.0/23 | 512 | ARIN | CA | 9th Nov 1993 |
| 198.161.190.0/24 | 256 | ARIN | CA | 9th Nov 1993 |
| 198.161.191.0/24 | 256 | ARIN | CA | 2nd Dec 1993 |
| 198.161.192.0/24 | 256 | ARIN | CA | 19th Jan 1994 |
| 198.161.193.0/24 | 256 | ARIN | CA | 7th Mar 1994 |
| 198.161.194.0/23 | 512 | ARIN | CA | 22nd Feb 1994 |
| 198.161.196.0/23 | 512 | ARIN | CA | 22nd Feb 1994 |
| 198.161.198.0/23 | 512 | ARIN | CA | 14th Mar 1994 |
| 198.161.204.0/24 | 256 | ARIN | CA | 31st Mar 1994 |
| 198.161.205.0/24 | 256 | ARIN | CA | 21st Apr 1994 |
| 198.161.207.0/24 | 256 | ARIN | CA | 11th May 1994 |
| 198.161.216.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 198.161.217.0/24 | 256 | ARIN | CA | 16th May 1994 |
| 198.161.219.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 198.161.221.0/24 | 256 | ARIN | CA | 3rd Jun 1994 |
| 198.161.23.0/24 | 256 | ARIN | CA | 19th Jan 1994 |