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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,075 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 179.253.64.0/18 | 16.4k | RIPE NCC |  US | 6th Mar 2025 |
| 179.254.128.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 179.254.192.0/19 | 8.2k | RIPE NCC |  AE | 6th Mar 2025 |
| 179.254.224.0/20 | 4.1k | APNIC |  IN | 13th Mar 2025 |
| 179.255.192.0/20 | 4.1k | ARIN | US | 13th Mar 2025 |
| 179.255.80.0/20 | 4.1k | ARIN | US | 13th Mar 2025 |
| 179.49.240.0/22 | 1k | LACNIC |  BR | 17th Aug 2020 |
| 179.51.252.0/22 | 1k | LACNIC |  BZ | 7th Nov 2013 |
| 179.61.0.0/21 | 2k | LACNIC |  AR | 6th Dec 2013 |
| 179.61.32.0/19 | 8.2k | LACNIC |  AW | 10th Dec 2013 |
| 179.63.232.0/22 | 1k | LACNIC |  CL | 28th May 2013 |
| 179.66.0.0/17 | 32.8k | ARIN |  CA | 8th Jun 2026 |
| 179.66.128.0/19 | 8.2k | RIPE NCC |  LT | 6th Mar 2025 |
| 179.67.0.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 179.67.128.0/18 | 16.4k | RIPE NCC | US | 20th Feb 2025 |
| 179.67.192.0/19 | 8.2k | RIPE NCC | LT | 6th Mar 2025 |
| 179.67.224.0/20 | 4.1k | RIPE NCC | LT | 13th Mar 2025 |
| 179.69.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 179.69.64.0/18 | 16.4k | RIPE NCC | AE | 20th Feb 2025 |
| 179.70.0.0/15 | 131k | APNIC |  SG | 20th Feb 2025 |
| 180.131.64.0/21 | 2k | APNIC |  JP | 20th Aug 2009 |
| 180.131.72.0/22 | 1k | APNIC | JP | 20th Aug 2009 |
| 180.131.76.0/22 | 1k | APNIC | JP | 20th Aug 2009 |
| 180.131.80.0/23 | 512 | APNIC | JP | 20th Aug 2009 |
| 180.131.82.0/24 | 256 | APNIC | JP | 20th Aug 2009 |
| 180.131.83.0/24 | 256 | APNIC | JP | 20th Aug 2009 |
| 180.131.84.0/22 | 1k | APNIC | JP | 20th Aug 2009 |
| 180.131.88.0/21 | 2k | APNIC | JP | 20th Aug 2009 |
| 180.148.152.0/21 | 2k | APNIC |  CN | 12th Apr 2011 |
| 180.148.16.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 180.148.216.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 180.148.224.0/19 | 8.2k | APNIC | CN | 31st Aug 2009 |
| 180.149.40.0/22 | 1k | RIPE NCC |  AT | 31st Aug 2009 |
| 180.178.0.0/19 | 8.2k | APNIC | IN | 10th Sept 2009 |
| 180.178.112.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 180.178.116.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 180.178.144.0/20 | 4.1k | APNIC |  PK | 15th Sept 2009 |
| 180.178.168.0/22 | 1k | APNIC | PK | 15th Sept 2009 |
| 180.187.0.0/16 | 65.5k | APNIC | CN | 15th Sept 2009 |
| 180.188.0.0/20 | 4.1k | APNIC | CN | 16th Sept 2009 |
| 180.188.226.0/23 | 512 | APNIC | IN | 18th Sept 2009 |
| 180.188.233.0/24 | 256 | APNIC | IN | 18th Sept 2009 |
| 180.188.238.0/23 | 512 | APNIC | IN | 18th Sept 2009 |
| 180.188.244.0/23 | 512 | APNIC | IN | 18th Sept 2009 |
| 180.188.48.0/20 | 4.1k | APNIC | CN | 16th Sept 2009 |
| 180.188.64.0/18 | 16.4k | APNIC | CN | 16th Sept 2009 |
| 180.189.148.0/22 | 1k | APNIC | CN | 22nd Sept 2009 |
| 180.200.232.0/22 | 1k | APNIC |  MY | 14th Jun 2010 |
| 180.204.0.0/14 | 262k | APNIC |  TW | 23rd Sept 2009 |
| 180.210.0.0/21 | 2k | APNIC |  KR | 25th Sept 2009 |