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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,108 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 190.112.44.0/22 | 1k | LACNIC |  AR | 5th Oct 2010 |
| 190.113.33.0/24 | 256 | LACNIC |  GT | 19th Feb 2021 |
| 190.113.34.0/23 | 512 | LACNIC | GT | 19th Feb 2021 |
| 190.12.224.0/19 | 8.2k | LACNIC |  AW | 14th May 2007 |
| 190.120.160.0/20 | 4.1k | LACNIC |  CL | 26th Jan 2009 |
| 190.123.160.0/20 | 4.1k | LACNIC |  VE | 22nd Sept 2009 |
| 190.123.176.0/20 | 4.1k | LACNIC | VE | 11th Apr 2012 |
| 190.123.48.0/20 | 4.1k | LACNIC |  EC | 14th Apr 2011 |
| 190.124.48.0/22 | 1k | LACNIC | CL | 22nd Jul 2020 |
| 190.149.128.0/22 | 1k | LACNIC | GT | 25th Feb 2009 |
| 190.149.132.0/23 | 512 | LACNIC | GT | 25th Feb 2009 |
| 190.149.136.0/21 | 2k | LACNIC | GT | 25th Feb 2009 |
| 190.168.128.0/18 | 16.4k | LACNIC | VE | 19th Apr 2007 |
| 190.168.192.0/18 | 16.4k | LACNIC | VE | 3rd May 2007 |
| 190.170.192.0/18 | 16.4k | LACNIC | VE | 5th May 2008 |
| 190.2.160.0/20 | 4.1k | LACNIC |  CW | 24th Aug 2006 |
| 190.2.176.0/21 | 2k | LACNIC | CW | 24th Aug 2006 |
| 190.2.188.0/23 | 512 | LACNIC | CW | 24th Aug 2006 |
| 190.2.190.0/24 | 256 | ARIN |  US | 26th May 2026 |
| 190.2.191.0/24 | 256 | LACNIC |  MX | 21st Jul 2026 |
| 190.211.144.0/24 | 256 | RIPE NCC |  NL | 22nd Oct 2010 |
| 190.4.224.0/19 | 8.2k | LACNIC | CL | 12th Mar 2008 |
| 190.4.96.0/20 | 4.1k | LACNIC | CL | 2nd May 2007 |
| 190.8.12.0/22 | 1k | LACNIC | AR | 5th Feb 2007 |
| 190.83.92.0/22 | 1k | LACNIC |  BR | 28th Feb 2020 |
| 190.9.160.0/20 | 4.1k | LACNIC | EC | 25th Jul 2007 |
| 190.9.176.0/23 | 512 | LACNIC | EC | 20th May 2008 |
| 190.9.178.0/24 | 256 | LACNIC | EC | 20th May 2008 |
| 190.9.180.0/24 | 256 | LACNIC | EC | 20th May 2008 |
| 190.9.181.0/24 | 256 | LACNIC | EC | 20th May 2008 |
| 190.9.184.0/21 | 2k | LACNIC | EC | 20th May 2008 |
| 190.93.232.0/21 | 2k | LACNIC | CL | 20th Nov 2009 |
| 190.97.104.0/21 | 2k | LACNIC |  TT | 5th Dec 2007 |
| 190.97.98.0/24 | 256 | LACNIC |  BZ | 5th Dec 2007 |
| 190.97.99.0/24 | 256 | LACNIC | TT | 5th Dec 2007 |
| 191.0.0.0/18 | 16.4k | ARIN | US | 24th Jul 2026 |
| 191.0.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 191.0.80.0/20 | 4.1k | RIPE NCC |  AE | 13th Mar 2025 |
| 191.0.96.0/19 | 8.2k | LACNIC | BR | 13th Jan 2014 |
| 191.102.48.0/21 | 2k | LACNIC |  NI | 12th Mar 2014 |
| 191.128.29.0/24 | 256 | LACNIC | BR | 17th Mar 2014 |
| 191.128.30.0/23 | 512 | LACNIC | BR | 17th Mar 2014 |
| 191.128.96.0/20 | 4.1k | LACNIC | BR | 17th Mar 2014 |
| 191.160.32.0/22 | 1k | LACNIC | BR | 24th Oct 2013 |
| 191.166.0.0/16 | 65.5k | LACNIC |  UY | 24th Oct 2013 |
| 191.2.0.0/15 | 131k | ARIN | US | 29th Jul 2026 |
| 191.212.0.0/15 | 131k | ARIN | US | 29th Jul 2026 |
| 191.215.0.0/19 | 8.2k | LACNIC | BR | 23rd Dec 2013 |
| 191.216.112.0/20 | 4.1k | RIPE NCC |  LT | 13th Mar 2025 |
| 191.216.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |