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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.50.192.0/22 | 1k | APNIC |  CN | 13th Feb 2015 |
| 103.50.196.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 103.50.200.0/22 | 1k | APNIC | CN | 13th Feb 2015 |
| 103.50.208.0/22 | 1k | APNIC |  IN | 13th Feb 2015 |
| 103.50.220.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.224.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.228.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.232.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.236.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.240.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.244.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.248.0/22 | 1k | APNIC | CN | 15th Feb 2015 |
| 103.50.36.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.44.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.48.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.52.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.56.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.60.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.64.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.68.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.72.0/22 | 1k | APNIC | CN | 11th Feb 2015 |
| 103.50.8.0/22 | 1k | APNIC |  HK | 10th Feb 2015 |
| 103.51.131.0/24 | 256 | APNIC |  ID | 25th Feb 2015 |
| 103.51.180.0/22 | 1k | APNIC |  JP | 27th Feb 2015 |
| 103.51.42.0/24 | 256 | APNIC |  AU | 18th Feb 2015 |
| 103.51.90.0/23 | 512 | APNIC |  TW | 8th Dec 2022 |
| 103.51.92.0/22 | 1k | APNIC | IN | 20th Feb 2015 |
| 103.52.104.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 103.52.112.0/23 | 512 | APNIC |  VN | 9th Dec 2022 |
| 103.52.120.0/22 | 1k | APNIC | ID | 9th Mar 2015 |
| 103.52.133.0/24 | 256 | APNIC | ID | 15th Sept 2022 |
| 103.52.136.0/22 | 1k | APNIC | IN | 9th Mar 2015 |
| 103.52.160.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 103.52.164.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 103.52.184.0/22 | 1k | APNIC | CN | 11th Mar 2015 |
| 103.52.194.0/23 | 512 | APNIC | IN | 13th Mar 2015 |
| 103.52.20.0/22 | 1k | APNIC | JP | 4th Mar 2015 |
| 103.52.214.0/23 | 512 | APNIC | HK | 17th Mar 2015 |
| 103.52.216.0/22 | 1k | APNIC | HK | 16th Mar 2015 |
| 103.52.224.0/22 | 1k | APNIC | IN | 16th Mar 2015 |
| 103.52.232.0/22 | 1k | APNIC | JP | 17th Mar 2015 |
| 103.52.240.0/22 | 1k | APNIC | JP | 17th Mar 2015 |
| 103.52.40.0/22 | 1k | APNIC | CN | 4th Mar 2015 |
| 103.52.7.0/24 | 256 | APNIC | ID | 5th Mar 2015 |
| 103.52.72.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 103.52.76.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 103.52.80.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 103.52.84.0/22 | 1k | APNIC | CN | 6th Mar 2015 |
| 103.52.92.0/22 | 1k | APNIC | VN | 6th Mar 2015 |
| 103.52.96.0/22 | 1k | APNIC | CN | 6th Mar 2015 |