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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.72.244.0/22 | 1k | APNIC |  CN | 23rd Aug 2016 |
| 103.72.248.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.72.252.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.72.28.0/22 | 1k | APNIC | CN | 16th Aug 2016 |
| 103.72.32.0/22 | 1k | APNIC | CN | 16th Aug 2016 |
| 103.72.36.0/22 | 1k | APNIC | CN | 16th Aug 2016 |
| 103.72.40.0/22 | 1k | APNIC | CN | 16th Aug 2016 |
| 103.72.44.0/22 | 1k | APNIC | CN | 16th Aug 2016 |
| 103.72.48.0/22 | 1k | APNIC | CN | 16th Aug 2016 |
| 103.72.52.0/22 | 1k | APNIC | CN | 16th Aug 2016 |
| 103.72.66.0/23 | 512 | APNIC |  VN | 8th Sept 2023 |
| 103.72.84.0/22 | 1k | APNIC |  PK | 17th Aug 2016 |
| 103.73.0.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.114.0/24 | 256 | APNIC |  AU | 29th Aug 2016 |
| 103.73.12.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.120.0/22 | 1k | APNIC | CN | 29th Aug 2016 |
| 103.73.124.0/24 | 256 | APNIC | AU | 29th Aug 2016 |
| 103.73.126.0/24 | 256 | APNIC | AU | 30th Aug 2016 |
| 103.73.127.0/24 | 256 | APNIC |  IN | 31st Aug 2016 |
| 103.73.128.0/22 | 1k | APNIC | CN | 29th Aug 2016 |
| 103.73.132.0/22 | 1k | APNIC | CN | 29th Aug 2016 |
| 103.73.156.0/23 | 512 | APNIC | IN | 30th Aug 2016 |
| 103.73.16.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.168.0/22 | 1k | APNIC | CN | 30th Aug 2016 |
| 103.73.176.0/22 | 1k | APNIC | CN | 30th Aug 2016 |
| 103.73.20.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.208.0/22 | 1k | APNIC | CN | 31st Aug 2016 |
| 103.73.24.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.244.0/22 | 1k | APNIC | CN | 1st Sept 2016 |
| 103.73.248.0/22 | 1k | APNIC | CN | 1st Sept 2016 |
| 103.73.28.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.4.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.8.0/22 | 1k | APNIC | CN | 23rd Aug 2016 |
| 103.73.92.0/22 | 1k | APNIC | IN | 27th Aug 2016 |
| 103.74.12.0/23 | 512 | APNIC |  ID | 2nd Sept 2016 |
| 103.74.148.0/22 | 1k | APNIC | CN | 8th Sept 2016 |
| 103.74.152.0/22 | 1k | APNIC | CN | 8th Sept 2016 |
| 103.74.156.0/22 | 1k | APNIC | CN | 8th Sept 2016 |
| 103.74.165.0/24 | 256 | APNIC | ID | 8th Sept 2016 |
| 103.74.204.0/22 | 1k | APNIC | CN | 9th Sept 2016 |
| 103.74.212.0/23 | 512 | APNIC | ID | 9th Sept 2016 |
| 103.74.232.0/22 | 1k | APNIC | CN | 12th Sept 2016 |
| 103.74.32.0/22 | 1k | APNIC | CN | 5th Sept 2016 |
| 103.74.36.0/22 | 1k | APNIC | CN | 5th Sept 2016 |
| 103.74.40.0/22 | 1k | APNIC | CN | 5th Sept 2016 |
| 103.74.44.0/22 | 1k | APNIC | CN | 5th Sept 2016 |
| 103.74.52.0/23 | 512 | APNIC |  HK | 5th Sept 2016 |
| 103.74.56.0/22 | 1k | APNIC | CN | 5th Sept 2016 |
| 103.74.6.0/23 | 512 | APNIC | ID | 2nd Sept 2016 |
| 103.74.60.0/22 | 1k | APNIC | CN | 5th Sept 2016 |