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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
85,256 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 198.52.32.0/23 | 512 | ARIN |  US | 22nd Feb 2016 |
| 198.52.34.0/23 | 512 | ARIN | US | 20th Aug 2026 |
| 198.52.37.0/24 | 256 | ARIN | US | 17th Jun 2026 |
| 198.52.38.0/24 | 256 | ARIN | US | 8th Jun 2026 |
| 198.52.39.0/24 | 256 | ARIN | US | 6th Jul 2026 |
| 198.52.4.0/22 | 1k | ARIN | US | 8th Feb 1993 |
| 198.52.41.0/24 | 256 | ARIN | US | 3rd Aug 2016 |
| 198.54.0.0/24 | 256 | ARIN | US | 24th Sept 2013 |
| 198.54.141.0/24 | 256 | AFRINIC |  ZA | 1st Jan 1994 |
| 198.54.142.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.143.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.144.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.145.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.146.0/24 | 256 | AFRINIC | ZA | 28th Jan 1994 |
| 198.54.147.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.148.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.15.0/24 | 256 | AFRINIC | ZA | 6th May 1993 |
| 198.54.150.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.151.0/24 | 256 | AFRINIC | ZA | 5th May 1993 |
| 198.54.152.0/23 | 512 | ARIN | US | 26th Jul 2021 |
| 198.54.16.0/24 | 256 | AFRINIC | ZA | 6th Jun 1993 |
| 198.54.162.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.164.0/24 | 256 | ARIN | US | 26th Sept 2013 |
| 198.54.17.0/24 | 256 | AFRINIC | ZA | 6th May 1993 |
| 198.54.175.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.176.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.177.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.178.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.179.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.18.0/24 | 256 | AFRINIC | ZA | 6th May 1993 |
| 198.54.180.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.181.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.183.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.19.0/24 | 256 | AFRINIC | ZA | 6th May 1993 |
| 198.54.190.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.191.0/24 | 256 | AFRINIC | ZA | 23rd Jun 1993 |
| 198.54.197.0/24 | 256 | AFRINIC | ZA | 28th Oct 2002 |
| 198.54.198.0/24 | 256 | AFRINIC | ZA | 28th Oct 2002 |
| 198.54.199.0/24 | 256 | AFRINIC | ZA | 22nd Jun 1993 |
| 198.54.203.0/24 | 256 | AFRINIC | ZA | 31st Aug 1993 |
| 198.54.208.0/23 | 512 | AFRINIC | ZA | 31st Aug 1993 |
| 198.54.210.0/24 | 256 | AFRINIC | ZA | 1st Sept 1993 |
| 198.54.220.0/24 | 256 | AFRINIC | ZA | 1st Sept 1993 |
| 198.54.225.0/24 | 256 | AFRINIC | ZA | 25th Oct 2002 |
| 198.54.226.0/24 | 256 | AFRINIC | ZA | 1st Sept 1993 |
| 198.54.227.0/24 | 256 | AFRINIC | ZA | 1st Sept 1993 |
| 198.54.229.0/24 | 256 | AFRINIC | ZA | 1st Sept 1993 |
| 198.54.231.0/24 | 256 | AFRINIC | ZA | 1st Sept 1993 |
| 198.54.232.0/24 | 256 | AFRINIC | ZA | 1st Sept 1993 |
| 198.54.235.0/24 | 256 | ARIN | US | 8th Oct 2013 |