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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,310 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 199.43.117.0/24 | 256 | ARIN |  CA | 11th Mar 1994 |
| 199.43.118.0/24 | 256 | ARIN | CA | 29th Mar 1994 |
| 199.43.122.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 199.43.123.0/24 | 256 | ARIN | CA | 26th Apr 1994 |
| 199.43.124.0/22 | 1k | ARIN | CA | 26th Apr 1994 |
| 199.43.128.0/23 | 512 | ARIN | CA | 26th Apr 1994 |
| 199.43.136.0/21 | 2k | ARIN | CA | 14th Mar 1994 |
| 199.43.144.0/23 | 512 | ARIN | CA | 10th Jul 2014 |
| 199.43.147.0/24 | 256 | ARIN | CA | 14th Mar 1994 |
| 199.43.150.0/23 | 512 | ARIN | CA | 10th Mar 1994 |
| 199.43.152.0/21 | 2k | ARIN | CA | 10th Mar 1994 |
| 199.43.16.0/23 | 512 | ARIN |  US | 2nd Feb 1994 |
| 199.43.160.0/21 | 2k | ARIN | CA | 10th Mar 1994 |
| 199.43.168.0/22 | 1k | ARIN | CA | 10th Mar 1994 |
| 199.43.18.0/24 | 256 | APNIC |  JP | 18th Mar 1994 |
| 199.43.188.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.43.19.0/24 | 256 | APNIC |  HK | 18th Mar 1994 |
| 199.43.192.0/23 | 512 | ARIN | US | 1st Mar 1994 |
| 199.43.194.0/24 | 256 | ARIN | US | 1st Mar 1994 |
| 199.43.2.0/24 | 256 | ARIN | CA | 12th Jan 1994 |
| 199.43.20.0/22 | 1k | ARIN | US | 2nd Feb 1994 |
| 199.43.208.0/20 | 4.1k | ARIN | US | 16th Dec 1993 |
| 199.43.226.0/23 | 512 | ARIN | US | 7th Dec 1993 |
| 199.43.228.0/22 | 1k | ARIN | US | 7th Dec 1993 |
| 199.43.232.0/22 | 1k | ARIN | US | 7th Dec 1993 |
| 199.43.236.0/23 | 512 | ARIN | US | 7th Dec 1993 |
| 199.43.238.0/23 | 512 | ARIN | US | 7th Dec 1993 |
| 199.43.24.0/21 | 2k | ARIN | US | 2nd Feb 1994 |
| 199.43.240.0/23 | 512 | ARIN | US | 7th Dec 1993 |
| 199.43.242.0/24 | 256 | ARIN | US | 7th Dec 1993 |
| 199.43.243.0/24 | 256 | ARIN | CA | 7th Dec 1993 |
| 199.43.244.0/23 | 512 | ARIN | CA | 7th Dec 1993 |
| 199.43.246.0/23 | 512 | RIPE NCC |  CH | 1st Sept 1993 |
| 199.43.248.0/24 | 256 | ARIN | CA | 17th May 1994 |
| 199.43.3.0/24 | 256 | ARIN | CA | 1st Feb 1994 |
| 199.43.32.0/21 | 2k | ARIN | US | 2nd Feb 1994 |
| 199.43.40.0/22 | 1k | ARIN | US | 2nd Feb 1994 |
| 199.43.45.0/24 | 256 | APNIC | HK | 18th Mar 1994 |
| 199.43.46.0/23 | 512 | ARIN | US | 2nd Feb 1994 |
| 199.43.62.0/24 | 256 | ARIN | US | 2nd Feb 1994 |
| 199.43.63.0/24 | 256 | APNIC | HK | 18th Mar 1994 |
| 199.43.96.0/21 | 2k | ARIN | US | 2nd Feb 1994 |
| 199.45.0.0/21 | 2k | ARIN | US | 5th Nov 1993 |
| 199.45.8.0/22 | 1k | ARIN | US | 5th Nov 1993 |
| 199.46.64.0/19 | 8.2k | ARIN | US | 14th Mar 1994 |
| 199.47.1.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 199.47.12.0/23 | 512 | ARIN | US | 8th Nov 1993 |
| 199.47.132.0/22 | 1k | ARIN | US | 6th Oct 2010 |
| 199.47.14.0/24 | 256 | ARIN | US | 8th Nov 1993 |
| 199.47.2.0/24 | 256 | ARIN | US | 8th Nov 1993 |