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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 42.62.180.0/22 | 1k | APNIC |  CN | 14th Apr 2011 |
| 42.62.184.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.62.192.0/18 | 16.4k | APNIC |  AU | 22nd Mar 2011 |
| 42.8.0.0/13 | 524k | APNIC |  KR | 7th Feb 2011 |
| 42.83.64.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.83.80.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.83.88.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.83.96.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.96.104.0/22 | 1k | APNIC |  IN | 22nd Mar 2011 |
| 42.96.108.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.96.112.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 42.96.6.0/24 | 256 | APNIC |  VN | 29th Mar 2011 |
| 42.96.64.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.96.7.0/24 | 256 | APNIC | VN | 29th Mar 2011 |
| 42.96.8.0/24 | 256 | APNIC | VN | 29th Mar 2011 |
| 42.96.9.0/24 | 256 | APNIC | VN | 29th Mar 2011 |
| 42.96.96.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.99.112.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 42.99.120.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 42.99.64.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 42.99.96.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 43.148.0.0/14 | 262k | APNIC | CN | 21st Feb 1989 |
| 43.224.100.0/22 | 1k | APNIC | CN | 21st Nov 2014 |
| 43.224.140.0/22 | 1k | APNIC |  JP | 16th Jun 2017 |
| 43.224.160.0/22 | 1k | APNIC | CN | 25th Nov 2014 |
| 43.224.176.0/22 | 1k | APNIC | CN | 25th Nov 2014 |
| 43.224.184.0/22 | 1k | APNIC | CN | 26th Nov 2014 |
| 43.224.196.0/22 | 1k | APNIC |  HK | 26th Nov 2014 |
| 43.224.200.0/22 | 1k | APNIC | CN | 26th Nov 2014 |
| 43.224.204.0/22 | 1k | APNIC | CN | 26th Nov 2014 |
| 43.224.208.0/22 | 1k | APNIC | CN | 26th Nov 2014 |
| 43.224.212.0/22 | 1k | APNIC | CN | 26th Nov 2014 |
| 43.224.216.0/22 | 1k | APNIC | CN | 26th Nov 2014 |
| 43.224.44.0/22 | 1k | APNIC | CN | 19th Nov 2014 |
| 43.224.68.0/22 | 1k | APNIC | CN | 20th Nov 2014 |
| 43.224.72.0/22 | 1k | APNIC | CN | 20th Nov 2014 |
| 43.225.136.0/22 | 1k | APNIC |  BN | 5th Dec 2014 |
| 43.225.152.0/22 | 1k | APNIC |  SG | 5th Dec 2014 |
| 43.225.216.0/21 | 2k | APNIC | CN | 10th Dec 2014 |
| 43.225.224.0/21 | 2k | APNIC | CN | 10th Dec 2014 |
| 43.225.232.0/22 | 1k | APNIC | CN | 10th Dec 2014 |
| 43.225.236.0/22 | 1k | APNIC | CN | 10th Dec 2014 |
| 43.225.240.0/21 | 2k | APNIC | CN | 10th Dec 2014 |
| 43.225.4.0/22 | 1k | APNIC | SG | 29th Nov 2014 |
| 43.226.100.0/22 | 1k | APNIC | CN | 14th Dec 2014 |
| 43.226.104.0/22 | 1k | APNIC | CN | 14th Dec 2014 |
| 43.226.108.0/22 | 1k | APNIC | CN | 14th Dec 2014 |
| 43.226.112.0/22 | 1k | APNIC | CN | 15th Dec 2014 |
| 43.226.120.0/22 | 1k | APNIC | CN | 15th Dec 2014 |
| 43.226.160.0/22 | 1k | APNIC | CN | 15th Dec 2014 |