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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.
Unannounced blocks in Canada
3,775 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 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 |
| 198.161.233.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.236.0/24 | 256 | ARIN | CA | 30th Jun 1994 |
| 198.161.241.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.242.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.249.0/24 | 256 | ARIN | CA | 14th Dec 1993 |
| 198.161.252.0/23 | 512 | ARIN | CA | 14th Dec 1993 |
| 198.161.5.0/24 | 256 | ARIN | CA | 4th Jun 1993 |
| 198.161.64.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.65.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.66.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.67.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.68.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.69.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.7.0/24 | 256 | ARIN | CA | 9th Sept 1993 |
| 198.161.70.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.71.0/24 | 256 | ARIN | CA | 29th Jun 1993 |
| 198.161.72.0/24 | 256 | ARIN | CA | 29th Jun 1993 |