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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with unannounced space registered through ARIN, largest first.
Unannounced blocks registered through ARIN
30,463 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.167.163.0/24 | 256 | ARIN |  US | 3rd Apr 2013 |
| 198.167.2.0/24 | 256 | ARIN |  CA | 15th Sept 1993 |
| 198.167.250.0/24 | 256 | ARIN | CA | 18th Feb 1997 |
| 198.167.251.0/24 | 256 | ARIN | CA | 24th Nov 1996 |
| 198.167.252.0/24 | 256 | ARIN | CA | 18th Apr 1996 |
| 198.167.253.0/24 | 256 | ARIN | CA | 12th Mar 1996 |
| 198.167.254.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.167.3.0/24 | 256 | ARIN | CA | 15th Sept 1993 |
| 198.167.4.0/24 | 256 | ARIN | CA | 15th Sept 1993 |
| 198.167.5.0/24 | 256 | ARIN | CA | 15th Sept 1993 |
| 198.167.6.0/23 | 512 | ARIN | CA | 15th Dec 1993 |
| 198.167.8.0/22 | 1k | ARIN | CA | 15th Dec 1993 |
| 198.168.10.0/24 | 256 | ARIN | CA | 8th Dec 1993 |
| 198.168.104.0/24 | 256 | ARIN | CA | 20th Jul 1993 |
| 198.168.11.0/24 | 256 | ARIN | CA | 13th Jan 1994 |
| 198.168.118.0/23 | 512 | ARIN | CA | 15th Mar 1994 |
| 198.168.12.0/22 | 1k | ARIN | CA | 28th Jul 1993 |
| 198.168.126.0/24 | 256 | ARIN | US | 9th Apr 2013 |
| 198.168.127.0/24 | 256 | ARIN | CA | 31st Mar 1994 |
| 198.168.18.0/23 | 512 | ARIN | CA | 22nd Sept 1993 |
| 198.168.192.0/24 | 256 | ARIN | US | 15th Oct 1993 |
| 198.168.193.0/24 | 256 | ARIN | CA | 15th Mar 1994 |
| 198.168.194.0/24 | 256 | ARIN | CA | 15th Mar 1994 |
| 198.168.195.0/24 | 256 | ARIN | CA | 23rd May 1994 |
| 198.168.196.0/22 | 1k | ARIN | CA | 14th Mar 1994 |
| 198.168.20.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.168.200.0/22 | 1k | ARIN | CA | 8th Apr 1994 |
| 198.168.204.0/23 | 512 | ARIN | CA | 8th Apr 1994 |
| 198.168.206.0/24 | 256 | ARIN | CA | 8th Apr 1994 |
| 198.168.208.0/20 | 4.1k | ARIN | CA | 8th Dec 1993 |
| 198.168.21.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.168.22.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.168.224.0/24 | 256 | ARIN | CA | 15th Nov 1993 |
| 198.168.225.0/24 | 256 | ARIN | CA | 24th Nov 1993 |
| 198.168.226.0/23 | 512 | ARIN | CA | 24th Nov 1993 |
| 198.168.23.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.168.232.0/23 | 512 | ARIN | CA | 26th Nov 1993 |
| 198.168.24.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.168.244.0/22 | 1k | ARIN | CA | 15th Feb 1994 |
| 198.168.248.0/23 | 512 | ARIN | CA | 15th Feb 1994 |
| 198.168.25.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.168.250.0/23 | 512 | ARIN | CA | 31st Mar 1994 |
| 198.168.26.0/24 | 256 | ARIN | CA | 20th Sept 1993 |
| 198.168.29.0/24 | 256 | ARIN | CA | 18th Jan 1994 |
| 198.168.3.0/24 | 256 | ARIN | CA | 12th Jul 1993 |
| 198.168.30.0/24 | 256 | ARIN | US | 4th May 1993 |
| 198.168.4.0/24 | 256 | ARIN | CA | 9th Jul 1993 |
| 198.168.42.0/24 | 256 | ARIN | CA | 14th Feb 1994 |
| 198.168.43.0/24 | 256 | ARIN | US | 5th Apr 2013 |
| 198.168.56.0/21 | 2k | ARIN | CA | 7th Dec 1993 |