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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,356 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 210.24.231.0/24 | 256 | APNIC |  JP | 16th Dec 1996 |
| 210.24.233.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.235.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.239.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.241.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.243.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.247.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.248.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.24.48.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.53.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.55.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.65.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.66.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.68.0/22 | 1k | APNIC | JP | 16th Dec 1996 |
| 210.24.72.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.24.80.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.84.0/23 | 512 | APNIC | JP | 16th Dec 1996 |
| 210.24.87.0/24 | 256 | APNIC | JP | 16th Dec 1996 |
| 210.24.88.0/21 | 2k | APNIC | JP | 16th Dec 1996 |
| 210.244.128.0/18 | 16.4k | APNIC |  TW | 15th Jan 1999 |
| 210.244.224.0/19 | 8.2k | APNIC | TW | 15th Jan 1999 |
| 210.247.128.0/18 | 16.4k | APNIC |  SG | 15th Nov 2005 |
| 210.247.2.0/24 | 256 | APNIC | JP | 1st Apr 2004 |
| 210.247.208.0/20 | 4.1k | APNIC |  AU | 27th May 2008 |
| 210.247.224.0/20 | 4.1k | APNIC | AU | 12th Aug 2008 |
| 210.247.3.0/24 | 256 | APNIC | JP | 1st Apr 2004 |
| 210.4.208.0/21 | 2k | APNIC |  NZ | 14th Jun 2006 |
| 210.4.216.0/22 | 1k | APNIC |  KR | 21st Sept 2007 |
| 210.4.80.0/21 | 2k | APNIC | AU | 14th Jun 2006 |
| 210.56.192.0/19 | 8.2k | APNIC |  CN | 9th Nov 2004 |
| 210.57.128.0/18 | 16.4k | APNIC |  HK | 23rd Aug 2001 |
| 210.62.128.0/19 | 8.2k | APNIC | TW | 29th Aug 1997 |
| 210.62.160.0/20 | 4.1k | APNIC | TW | 29th Aug 1997 |
| 210.62.248.0/21 | 2k | APNIC | TW | 29th Aug 1997 |
| 210.67.128.0/20 | 4.1k | APNIC | TW | 4th Sept 1996 |
| 210.7.56.0/22 | 1k | APNIC | CN | 13th Nov 2015 |
| 210.7.60.0/22 | 1k | APNIC | CN | 13th Nov 2015 |
| 210.75.128.0/19 | 8.2k | APNIC | CN | 6th Apr 1998 |
| 210.75.160.0/19 | 8.2k | APNIC | CN | 6th Apr 1998 |
| 210.76.224.0/19 | 8.2k | APNIC | CN | 11th Aug 1998 |
| 210.77.96.0/19 | 8.2k | APNIC | CN | 11th Aug 1998 |
| 210.78.0.0/19 | 8.2k | APNIC | CN | 11th Aug 1998 |
| 210.78.160.0/19 | 8.2k | APNIC | CN | 11th Aug 1998 |
| 210.78.192.0/18 | 16.4k | APNIC | CN | 11th Aug 1998 |
| 210.78.32.0/19 | 8.2k | APNIC | CN | 11th Aug 1998 |
| 210.78.64.0/18 | 16.4k | APNIC | CN | 11th Aug 1998 |
| 210.79.144.0/24 | 256 | APNIC |  ID | 29th Nov 2023 |
| 210.79.176.0/23 | 512 | APNIC |  VN | 30th Nov 2023 |
| 210.79.64.0/18 | 16.4k | APNIC | CN | 10th Nov 2004 |
| 210.87.114.0/23 | 512 | APNIC | CN | 6th Dec 2023 |