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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,936 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.216.20.0/22 | 1k | APNIC |  CN | 27th Apr 2016 |
| 103.216.224.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.216.24.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.240.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.216.244.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.216.248.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.216.28.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.32.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.36.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.4.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.40.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.44.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.64.0/22 | 1k | APNIC | CN | 28th Apr 2016 |
| 103.216.8.0/22 | 1k | APNIC | CN | 27th Apr 2016 |
| 103.216.84.0/23 | 512 | APNIC |  SG | 28th Apr 2016 |
| 103.216.86.0/24 | 256 | APNIC |  IN | 28th Apr 2016 |
| 103.217.0.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.107.0/24 | 256 | APNIC | IN | 21st Mar 2023 |
| 103.217.12.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.140.0/22 | 1k | APNIC | IN | 6th May 2016 |
| 103.217.16.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.168.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 103.217.180.0/22 | 1k | APNIC | CN | 9th May 2016 |
| 103.217.20.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.24.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.248.0/24 | 256 | APNIC |  AU | 10th May 2016 |
| 103.217.28.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.32.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.36.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.4.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.40.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.44.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.48.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.52.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.56.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.60.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.217.76.0/24 | 256 | APNIC |  ID | 20th Mar 2023 |
| 103.217.8.0/22 | 1k | APNIC | CN | 4th May 2016 |
| 103.218.116.0/22 | 1k | APNIC | IN | 11th May 2016 |
| 103.218.12.0/22 | 1k | APNIC | CN | 11th May 2016 |
| 103.218.128.0/22 | 1k | APNIC | IN | 11th May 2016 |
| 103.218.140.0/22 | 1k | APNIC | IN | 11th May 2016 |
| 103.218.152.0/22 | 1k | APNIC | IN | 11th May 2016 |
| 103.218.16.0/22 | 1k | APNIC | CN | 11th May 2016 |
| 103.218.178.0/23 | 512 | APNIC | CN | 15th Sept 2023 |
| 103.218.180.0/23 | 512 | APNIC | IN | 12th Jun 2023 |
| 103.218.184.0/23 | 512 | APNIC | IN | 12th Jun 2023 |
| 103.218.192.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 103.218.196.0/22 | 1k | APNIC | CN | 13th May 2016 |
| 103.218.20.0/22 | 1k | APNIC | CN | 11th May 2016 |