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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 198.200.232.0/23 | 512 | ARIN |  US | 11th Apr 1994 |
| 198.200.234.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.235.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.237.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.239.0/24 | 256 | ARIN | US | 11th Apr 1994 |
| 198.200.243.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.245.0/24 | 256 | ARIN | US | 8th Dec 1995 |
| 198.200.247.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.249.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.251.0/24 | 256 | ARIN | US | 12th Apr 1994 |
| 198.200.252.0/22 | 1k | ARIN | US | 21st Mar 1994 |
| 198.200.28.0/22 | 1k | ARIN |  CA | 27th Mar 2020 |
| 198.200.4.0/24 | 256 | APNIC |  NL | 21st Jun 1993 |
| 198.200.5.0/24 | 256 | APNIC | NL | 10th Aug 1993 |
| 198.200.6.0/23 | 512 | APNIC | NL | 10th Aug 1993 |
| 198.200.8.0/23 | 512 | APNIC | NL | 10th Aug 1993 |
| 198.202.131.0/24 | 256 | ARIN | US | 6th Oct 1993 |
| 198.202.132.0/22 | 1k | ARIN | US | 6th Oct 1993 |
| 198.202.136.0/24 | 256 | ARIN | US | 6th Oct 1993 |
| 198.202.138.0/24 | 256 | ARIN | US | 6th Oct 1993 |
| 198.202.140.0/24 | 256 | ARIN | US | 7th Oct 1993 |
| 198.202.147.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.149.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.150.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.152.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.153.0/24 | 256 | ARIN | US | 8th Oct 1993 |
| 198.202.154.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.155.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.156.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.157.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.158.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.159.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.160.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.161.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.162.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.163.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.164.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.165.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.166.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.167.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.168.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.169.0/24 | 256 | ARIN | US | 11th Oct 1993 |
| 198.202.170.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.202.172.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.202.173.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.202.174.0/24 | 256 | ARIN | US | 4th Apr 1994 |
| 198.202.178.0/23 | 512 | ARIN | US | 12th Oct 1993 |
| 198.202.183.0/24 | 256 | ARIN | US | 12th Oct 1993 |
| 198.202.185.0/24 | 256 | ARIN | US | 13th Oct 1993 |
| 198.202.187.0/24 | 256 | ARIN | US | 13th Oct 1993 |