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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,906 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.202.236.0/22 | 1k | APNIC |  CN | 26th Nov 2015 |
| 103.202.240.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.202.244.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.202.248.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.202.252.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.202.56.0/22 | 1k | APNIC | CN | 23rd Nov 2015 |
| 103.202.64.0/22 | 1k | APNIC | CN | 23rd Nov 2015 |
| 103.202.72.0/22 | 1k | APNIC | CN | 23rd Nov 2015 |
| 103.202.76.0/22 | 1k | APNIC | CN | 23rd Nov 2015 |
| 103.202.80.0/22 | 1k | APNIC | CN | 23rd Nov 2015 |
| 103.202.84.0/22 | 1k | APNIC | CN | 23rd Nov 2015 |
| 103.202.88.0/22 | 1k | APNIC | CN | 23rd Nov 2015 |
| 103.203.0.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.100.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.104.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.108.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.112.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.116.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.12.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.120.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.124.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.128.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 103.203.16.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.164.0/22 | 1k | APNIC | CN | 1st Dec 2015 |
| 103.203.168.0/22 | 1k | APNIC | CN | 1st Dec 2015 |
| 103.203.189.0/24 | 256 | APNIC |  ID | 3rd Dec 2015 |
| 103.203.190.0/23 | 512 | APNIC |  AU | 2nd Dec 2015 |
| 103.203.192.0/22 | 1k | APNIC | CN | 2nd Dec 2015 |
| 103.203.20.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.200.0/22 | 1k | APNIC | CN | 2nd Dec 2015 |
| 103.203.212.0/22 | 1k | APNIC | CN | 2nd Dec 2015 |
| 103.203.24.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.246.0/23 | 512 | APNIC | AU | 26th Sept 2023 |
| 103.203.248.0/23 | 512 | APNIC | ID | 17th May 2023 |
| 103.203.28.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.32.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.4.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.203.8.0/22 | 1k | APNIC | CN | 26th Nov 2015 |
| 103.204.112.0/22 | 1k | APNIC | CN | 15th Dec 2015 |
| 103.204.116.0/24 | 256 | APNIC | ID | 27th Feb 2023 |
| 103.204.136.0/22 | 1k | APNIC | CN | 16th Dec 2015 |
| 103.204.140.0/22 | 1k | APNIC | CN | 16th Dec 2015 |
| 103.204.144.0/22 | 1k | APNIC | CN | 16th Dec 2015 |
| 103.204.148.0/22 | 1k | APNIC | CN | 16th Dec 2015 |
| 103.204.152.0/22 | 1k | APNIC | CN | 16th Dec 2015 |
| 103.204.16.0/22 | 1k | APNIC |  MM | 7th Dec 2015 |
| 103.204.196.0/22 | 1k | APNIC | CN | 17th Dec 2015 |
| 103.204.216.0/23 | 512 | APNIC | CN | 26th Aug 2022 |
| 103.204.230.0/24 | 256 | APNIC |  JP | 22nd Dec 2015 |
| 103.204.232.0/22 | 1k | APNIC | CN | 22nd Dec 2015 |