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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 178.79.192.0/18 | 16.4k | RIPE NCC |  US | 12th May 2010 |
| 178.96.0.0/15 | 131k | APNIC |  SG | 18th Nov 2009 |
| 179.0.14.0/24 | 256 | LACNIC |  AR | 30th Jul 2013 |
| 179.0.148.0/24 | 256 | LACNIC | AR | 6th Jan 2014 |
| 179.0.150.0/24 | 256 | LACNIC |  BR | 21st Aug 2026 |
| 179.0.203.0/24 | 256 | LACNIC | AR | 9th Apr 2014 |
| 179.0.30.0/24 | 256 | LACNIC |  BO | 22nd Nov 2013 |
| 179.0.31.0/24 | 256 | LACNIC |  HN | 22nd Nov 2013 |
| 179.1.160.0/20 | 4.1k | LACNIC | AR | 26th Apr 2013 |
| 179.108.184.0/21 | 2k | LACNIC | BR | 11th Apr 2014 |
| 179.109.176.0/20 | 4.1k | LACNIC | BR | 20th Aug 2013 |
| 179.127.208.0/20 | 4.1k | LACNIC | BR | 11th Oct 2013 |
| 179.192.0.0/16 | 65.5k | APNIC | SG | 20th Feb 2025 |
| 179.193.128.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 179.194.0.0/15 | 131k | ARIN | US | 20th Feb 2025 |
| 179.196.0.0/16 | 65.5k | APNIC | SG | 20th Feb 2025 |
| 179.197.0.0/18 | 16.4k | ARIN | US | 20th Feb 2025 |
| 179.197.112.0/20 | 4.1k | APNIC |  IN | 13th Mar 2025 |
| 179.197.128.0/20 | 4.1k | APNIC | IN | 13th Mar 2025 |
| 179.198.240.0/20 | 4.1k | ARIN | US | 13th Mar 2025 |
| 179.198.80.0/20 | 4.1k | RIPE NCC |  LT | 13th Mar 2025 |
| 179.199.0.0/17 | 32.8k | ARIN | US | 29th Jul 2026 |
| 179.199.128.0/19 | 8.2k | RIPE NCC | LT | 6th Mar 2025 |
| 179.199.160.0/20 | 4.1k | APNIC | IN | 13th Mar 2025 |
| 179.236.0.0/19 | 8.2k | RIPE NCC |  CN | 6th Mar 2025 |
| 179.236.128.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 179.236.224.0/19 | 8.2k | RIPE NCC | LT | 6th Mar 2025 |
| 179.236.64.0/19 | 8.2k | RIPE NCC | LT | 6th Mar 2025 |
| 179.237.26.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.32.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.34.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.36.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.38.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.40.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.42.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.44.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.46.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.48.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.50.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.52.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.54.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.56.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.58.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.60.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.237.62.0/23 | 512 | LACNIC | BR | 10th Dec 2012 |
| 179.239.0.0/16 | 65.5k | ARIN | US | 20th Feb 2025 |
| 179.252.0.0/20 | 4.1k | APNIC | IN | 13th Mar 2025 |
| 179.252.160.0/20 | 4.1k | APNIC | IN | 13th Mar 2025 |
| 179.253.128.0/18 | 16.4k | RIPE NCC | US | 6th Mar 2025 |
| 179.253.32.0/19 | 8.2k | RIPE NCC |  AE | 6th Mar 2025 |