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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 in China
6,732 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 101.102.64.0/19 | 8.2k | APNIC |  CN | 12th Apr 2011 |
| 101.110.116.0/22 | 1k | APNIC | CN | 14th Apr 2011 |
| 101.110.120.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.110.64.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.110.96.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.120.0.0/14 | 262k | APNIC | CN | 13th Dec 2010 |
| 101.128.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.128.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.128.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.130.0.0/15 | 131k | APNIC | CN | 15th Dec 2010 |
| 101.196.0.0/16 | 65.5k | APNIC | CN | 4th Jan 2011 |
| 101.203.128.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.203.160.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.203.176.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.234.64.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.234.80.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.234.96.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.244.0.0/16 | 65.5k | APNIC | CN | 10th Jan 2011 |
| 101.251.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.251.32.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 101.251.8.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.36.0.0/18 | 16.4k | APNIC | CN | 14th Dec 2010 |
| 101.48.0.0/16 | 65.5k | APNIC | CN | 10th Dec 2010 |
| 101.54.0.0/16 | 65.5k | APNIC | CN | 16th Dec 2010 |
| 101.55.224.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.78.32.0/19 | 8.2k | APNIC | CN | 11th Mar 2011 |
| 101.96.0.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 101.96.16.0/20 | 4.1k | APNIC | CN | 12th Apr 2011 |
| 101.99.96.0/19 | 8.2k | APNIC | CN | 12th Apr 2011 |
| 103.1.24.0/22 | 1k | APNIC | CN | 18th Apr 2011 |
| 103.1.72.0/22 | 1k | APNIC | CN | 18th Apr 2011 |
| 103.1.88.0/22 | 1k | APNIC | CN | 18th Apr 2011 |
| 103.10.140.0/22 | 1k | APNIC | CN | 21st Jul 2011 |
| 103.10.16.0/22 | 1k | APNIC | CN | 13th May 2011 |
| 103.100.0.0/22 | 1k | APNIC | CN | 31st Aug 2017 |
| 103.100.116.0/22 | 1k | APNIC | CN | 6th Sept 2017 |
| 103.100.144.0/22 | 1k | APNIC | CN | 8th Sept 2017 |
| 103.100.236.0/22 | 1k | APNIC | CN | 13th Sept 2017 |
| 103.100.240.0/22 | 1k | APNIC | CN | 13th Sept 2017 |
| 103.100.248.0/22 | 1k | APNIC | CN | 14th Sept 2017 |
| 103.100.252.0/22 | 1k | APNIC | CN | 14th Sept 2017 |
| 103.100.32.0/22 | 1k | APNIC | CN | 4th Sept 2017 |
| 103.100.40.0/22 | 1k | APNIC | CN | 4th Sept 2017 |
| 103.100.48.0/22 | 1k | APNIC | CN | 4th Sept 2017 |
| 103.100.52.0/22 | 1k | APNIC | CN | 5th Sept 2017 |
| 103.100.56.0/22 | 1k | APNIC | CN | 5th Sept 2017 |
| 103.100.88.0/22 | 1k | APNIC | CN | 6th Sept 2017 |
| 103.101.12.0/22 | 1k | APNIC | CN | 14th Sept 2017 |
| 103.101.120.0/22 | 1k | APNIC | CN | 26th Sept 2017 |
| 103.101.144.0/22 | 1k | APNIC | CN | 27th Sept 2017 |