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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,248 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.179.250.0/24 | 256 | ARIN |  US | 18th Nov 1993 |
| 198.179.251.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.252.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.253.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.254.0/24 | 256 | ARIN | US | 18th Nov 1993 |
| 198.179.26.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.27.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.28.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.29.0/24 | 256 | ARIN | US | 28th Jun 1993 |
| 198.179.32.0/20 | 4.1k | ARIN | US | 25th May 1993 |
| 198.179.48.0/22 | 1k | ARIN | US | 25th May 1993 |
| 198.179.7.0/24 | 256 | ARIN |  CA | 15th Aug 2017 |
| 198.180.128.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.130.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.136.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.137.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.138.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.143.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.144.0/23 | 512 | ARIN | US | 2nd Aug 1993 |
| 198.180.146.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.148.0/24 | 256 | ARIN | US | 2nd Aug 1993 |
| 198.180.149.0/24 | 256 | ARIN | US | 3rd Aug 1993 |
| 198.180.16.0/20 | 4.1k | ARIN | US | 4th Jun 1993 |
| 198.180.161.0/24 | 256 | ARIN | US | 4th Aug 1993 |
| 198.180.162.0/23 | 512 | ARIN | US | 4th Aug 1993 |
| 198.180.164.0/24 | 256 | ARIN | US | 4th Aug 1993 |
| 198.180.166.0/24 | 256 | ARIN | US | 4th Aug 1993 |
| 198.180.167.0/24 | 256 | ARIN | US | 4th Aug 1993 |
| 198.180.168.0/22 | 1k | ARIN | US | 5th Aug 1993 |
| 198.180.172.0/22 | 1k | ARIN | US | 5th Aug 1993 |
| 198.180.176.0/23 | 512 | ARIN | US | 5th Aug 1993 |
| 198.180.178.0/24 | 256 | ARIN | US | 5th Aug 1993 |
| 198.180.179.0/24 | 256 | ARIN | US | 5th Aug 1993 |
| 198.180.180.0/24 | 256 | ARIN | US | 5th Aug 1993 |
| 198.180.185.0/24 | 256 | ARIN | US | 6th Aug 1993 |
| 198.180.186.0/23 | 512 | ARIN | US | 27th Dec 2013 |
| 198.180.189.0/24 | 256 | ARIN | US | 6th Aug 1993 |
| 198.180.190.0/24 | 256 | ARIN | US | 6th Aug 1993 |
| 198.180.191.0/24 | 256 | ARIN | US | 19th Mar 2013 |
| 198.180.192.0/24 | 256 | ARIN | US | 9th Aug 1993 |
| 198.180.193.0/24 | 256 | ARIN | US | 9th Aug 1993 |
| 198.180.194.0/24 | 256 | ARIN | US | 9th Aug 1993 |
| 198.180.196.0/24 | 256 | ARIN | US | 9th Aug 1993 |
| 198.180.201.0/24 | 256 | ARIN | US | 9th Aug 1993 |
| 198.180.202.0/24 | 256 | ARIN | US | 10th Oct 2022 |
| 198.180.203.0/24 | 256 | ARIN | US | 4th Feb 2013 |
| 198.180.204.0/24 | 256 | ARIN | US | 10th Aug 1993 |
| 198.180.205.0/24 | 256 | ARIN | US | 10th Aug 1993 |
| 198.180.208.0/23 | 512 | ARIN | US | 10th Aug 1993 |
| 198.180.210.0/24 | 256 | ARIN | US | 10th Aug 1993 |