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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,458 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 201.135.0.0/16 | 65.5k | LACNIC |  MX | 20th Apr 2009 |
| 201.139.160.0/21 | 2k | LACNIC | MX | 18th Aug 2005 |
| 201.139.32.0/19 | 8.2k | LACNIC | MX | 4th Jan 2005 |
| 201.141.128.0/17 | 32.8k | LACNIC | MX | 17th Mar 2006 |
| 201.148.192.0/20 | 4.1k | LACNIC | MX | 3rd Jul 2009 |
| 201.148.232.0/22 | 1k | LACNIC |  CR | 16th Jul 2014 |
| 201.15.128.0/20 | 4.1k | APNIC |  HK | 13th Mar 2025 |
| 201.15.160.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 201.15.208.0/20 | 4.1k | APNIC | HK | 13th Mar 2025 |
| 201.150.28.0/22 | 1k | LACNIC |  CL | 1st Jul 2014 |
| 201.150.60.0/22 | 1k | LACNIC |  PE | 24th Jul 2014 |
| 201.150.64.0/20 | 4.1k | LACNIC | MX | 29th Mar 2005 |
| 201.157.218.0/24 | 256 | LACNIC |  BR | 4th Jun 2014 |
| 201.157.248.0/23 | 512 | LACNIC | BR | 4th Jun 2014 |
| 201.157.250.0/24 | 256 | LACNIC | BR | 4th Jun 2014 |
| 201.158.100.0/22 | 1k | LACNIC | BR | 2nd Jan 2020 |
| 201.158.16.0/22 | 1k | LACNIC | MX | 28th Apr 2011 |
| 201.158.52.0/22 | 1k | LACNIC | PE | 23rd Jun 2014 |
| 201.159.148.0/22 | 1k | LACNIC | BR | 1st Jul 2014 |
| 201.159.64.0/22 | 1k | LACNIC | MX | 1st Mar 2007 |
| 201.159.68.0/23 | 512 | LACNIC | MX | 1st Mar 2007 |
| 201.169.0.0/16 | 65.5k | LACNIC | MX | 12th Jun 2014 |
| 201.18.192.0/19 | 8.2k | RIPE NCC |  LT | 13th Mar 2025 |
| 201.19.0.0/16 | 65.5k | ARIN |  US | 29th Jul 2026 |
| 201.221.121.0/24 | 256 | LACNIC | CL | 27th Sept 2012 |
| 201.222.16.0/22 | 1k | LACNIC |  AR | 27th Jun 2014 |
| 201.29.0.0/16 | 65.5k | ARIN | US | 27th May 2026 |
| 201.32.128.0/19 | 8.2k | ARIN | US | 4th Sept 2026 |
| 201.4.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.4.64.0/20 | 4.1k | RIPE NCC |  PL | 13th Mar 2025 |
| 201.46.122.0/23 | 512 | LACNIC | BR | 18th Aug 2005 |
| 201.49.148.0/23 | 512 | LACNIC | BR | 22nd Jun 2010 |
| 201.49.150.0/24 | 256 | LACNIC | BR | 22nd Jun 2010 |
| 201.49.151.0/24 | 256 | LACNIC | BR | 22nd Jun 2010 |
| 201.50.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.51.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.51.64.0/18 | 16.4k | RIPE NCC |  GB | 6th Mar 2025 |
| 201.58.0.0/18 | 16.4k | RIPE NCC | GB | 6th Mar 2025 |
| 201.58.128.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 201.58.224.0/19 | 8.2k | RIPE NCC | LT | 13th Mar 2025 |
| 201.58.96.0/19 | 8.2k | RIPE NCC | LT | 13th Mar 2025 |
| 201.7.16.0/20 | 4.1k | RIPE NCC | PL | 13th Mar 2025 |
| 201.71.204.0/22 | 1k | LACNIC | MX | 27th Feb 2020 |
| 201.78.0.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.78.224.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.8.0.0/19 | 8.2k | ARIN | US | 13th Mar 2025 |
| 201.8.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 201.8.32.0/20 | 4.1k | ARIN | US | 13th Mar 2025 |
| 201.8.64.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 201.87.139.0/24 | 256 | LACNIC | BR | 25th May 2006 |