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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,239 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 2620:fd::/48 | 65.5k × /64 | ARIN |  CA | 30th Mar 2011 |
| 2620:fd:c000::/48 | 65.5k × /64 | ARIN | CA | 4th Mar 2016 |
| 2620:fe:8000::/48 | 65.5k × /64 | ARIN |  US | 22nd Jun 2012 |
| 2620:ff:8000::/48 | 65.5k × /64 | ARIN | US | 1st Nov 2013 |
| 2620:ff::/48 | 65.5k × /64 | ARIN | US | 30th Mar 2011 |
| 2630::/16 | 281T × /64 | ARIN | US | 20th Oct 2023 |
| 2631:2000::/24 | 1.1T × /64 | ARIN | US | 2nd Jan 2025 |
| 2631:3000::/24 | 1.1T × /64 | ARIN | US | 10th Apr 2025 |
| 2631:8000::/24 | 1.1T × /64 | ARIN | US | 12th Nov 2025 |
| 2631:a000::/24 | 1.1T × /64 | ARIN | US | 11th May 2026 |
| 27.0.136.0/22 | 1k | APNIC |  IN | 29th Jan 2016 |
| 27.0.160.0/22 | 1k | APNIC |  CN | 1st Feb 2016 |
| 27.0.188.0/22 | 1k | APNIC | CN | 1st Feb 2016 |
| 27.0.64.0/19 | 8.2k | APNIC |  AU | 16th Mar 2010 |
| 27.0.96.0/19 | 8.2k | APNIC |  SG | 2nd Mar 2011 |
| 27.100.0.0/22 | 1k | APNIC | AU | 25th May 2010 |
| 27.100.16.0/21 | 2k | APNIC |  HK | 31st May 2010 |
| 27.103.0.0/16 | 65.5k | APNIC | CN | 28th May 2010 |
| 27.106.128.0/18 | 16.4k | APNIC | CN | 8th Jun 2010 |
| 27.106.192.0/21 | 2k | APNIC | AU | 8th Jun 2010 |
| 27.109.104.0/22 | 1k | APNIC | SG | 18th Jun 2010 |
| 27.109.32.0/19 | 8.2k | APNIC | CN | 7th Mar 2011 |
| 27.111.48.0/20 | 4.1k | APNIC |  ID | 29th Jun 2010 |
| 27.111.85.0/24 | 256 | APNIC | AU | 2nd Jul 2010 |
| 27.111.87.0/24 | 256 | APNIC | AU | 2nd Jul 2010 |
| 27.112.100.0/22 | 1k | APNIC | AU | 8th Jul 2010 |
| 27.112.112.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 27.112.116.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 27.112.76.0/24 | 256 | APNIC | ID | 6th Jul 2010 |
| 27.112.80.0/20 | 4.1k | APNIC | CN | 5th Jul 2010 |
| 27.113.128.0/18 | 16.4k | APNIC | CN | 8th Jul 2010 |
| 27.114.192.0/18 | 16.4k | APNIC | SG | 12th Jul 2010 |
| 27.116.32.0/22 | 1k | APNIC | SG | 16th Jul 2010 |
| 27.116.44.0/22 | 1k | APNIC | CN | 19th Jul 2010 |
| 27.118.128.0/17 | 32.8k | APNIC |  KR | 22nd Jul 2010 |
| 27.120.176.0/22 | 1k | APNIC |  JP | 2nd Sept 2010 |
| 27.121.120.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 27.121.72.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 27.122.0.0/22 | 1k | APNIC |  NC | 29th Sept 2010 |
| 27.122.12.0/22 | 1k | APNIC | SG | 4th Oct 2010 |
| 27.122.4.0/22 | 1k | APNIC | JP | 2nd Mar 2011 |
| 27.122.48.0/21 | 2k | APNIC | JP | 4th Oct 2010 |
| 27.123.224.0/23 | 512 | APNIC |  BD | 12th Aug 2026 |
| 27.123.226.0/24 | 256 | APNIC | AU | 13th Aug 2026 |
| 27.123.227.0/24 | 256 | APNIC | IN | 13th Aug 2026 |
| 27.123.236.0/22 | 1k | APNIC | JP | 5th Aug 2016 |
| 27.126.160.0/20 | 4.1k | APNIC | JP | 19th Oct 2010 |
| 27.131.200.0/21 | 2k | APNIC | JP | 21st Apr 2010 |
| 27.131.216.0/22 | 1k | APNIC | AU | 23rd Apr 2010 |
| 27.131.220.0/22 | 1k | APNIC | CN | 29th Apr 2010 |