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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,960 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.65.68.0/22 | 1k | APNIC |  CN | 8th Jun 2016 |
| 103.65.72.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 103.65.76.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 103.65.80.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 103.65.84.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 103.65.88.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 103.65.92.0/22 | 1k | APNIC | CN | 8th Jun 2016 |
| 103.66.108.0/22 | 1k | APNIC | CN | 16th Jun 2016 |
| 103.66.116.0/22 | 1k | APNIC |  IN | 16th Jun 2016 |
| 103.66.156.0/22 | 1k | APNIC | IN | 17th Jun 2016 |
| 103.66.160.0/22 | 1k | APNIC | IN | 17th Jun 2016 |
| 103.66.164.0/22 | 1k | APNIC | IN | 17th Jun 2016 |
| 103.66.171.0/24 | 256 | APNIC |  JP | 21st Jun 2016 |
| 103.66.172.0/22 | 1k | APNIC | IN | 18th Jun 2016 |
| 103.66.200.0/22 | 1k | APNIC | CN | 20th Jun 2016 |
| 103.66.228.0/23 | 512 | APNIC |  BD | 11th Jan 2023 |
| 103.66.240.0/22 | 1k | APNIC | CN | 22nd Jun 2016 |
| 103.66.244.0/22 | 1k | APNIC | CN | 22nd Jun 2016 |
| 103.66.248.0/22 | 1k | APNIC | CN | 22nd Jun 2016 |
| 103.66.252.0/22 | 1k | APNIC | CN | 22nd Jun 2016 |
| 103.66.36.0/24 | 256 | APNIC |  ID | 28th Sept 2022 |
| 103.66.40.0/22 | 1k | APNIC | CN | 14th Jun 2016 |
| 103.66.52.0/23 | 512 | APNIC |  AU | 15th Jun 2016 |
| 103.66.80.0/22 | 1k | APNIC | IN | 15th Jun 2016 |
| 103.66.88.0/22 | 1k | APNIC |  PH | 16th Jun 2016 |
| 103.67.0.0/22 | 1k | APNIC | CN | 22nd Jun 2016 |
| 103.67.100.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.104.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.108.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.112.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.116.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.120.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.124.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.128.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.132.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.136.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.140.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.144.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.148.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.67.164.0/24 | 256 | APNIC | AU | 24th Jun 2016 |
| 103.67.172.0/22 | 1k | APNIC | CN | 24th Jun 2016 |
| 103.67.178.0/23 | 512 | APNIC | IN | 24th Jun 2016 |
| 103.67.192.0/22 | 1k | APNIC | CN | 24th Jun 2016 |
| 103.67.212.0/22 | 1k | APNIC | CN | 27th Jun 2016 |
| 103.67.216.0/24 | 256 | APNIC | ID | 27th Jun 2016 |
| 103.67.224.0/22 | 1k | APNIC |  HK | 28th Jun 2016 |
| 103.67.249.0/24 | 256 | APNIC | AU | 29th Jun 2016 |
| 103.67.250.0/24 | 256 | APNIC | AU | 29th Jun 2016 |
| 103.67.252.0/22 | 1k | APNIC | CN | 29th Jun 2016 |
| 103.67.4.0/22 | 1k | APNIC | CN | 22nd Jun 2016 |