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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,871 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.20.166.0/23 | 512 | APNIC |  ID | 19th Sept 2012 |
| 103.20.176.0/22 | 1k | APNIC |  TW | 19th Sept 2012 |
| 103.20.21.0/24 | 256 | APNIC | ID | 10th Sept 2012 |
| 103.20.24.0/22 | 1k | APNIC |  BN | 7th Sept 2012 |
| 103.20.244.0/24 | 256 | APNIC |  IN | 15th Aug 2022 |
| 103.20.56.0/24 | 256 | APNIC |  AU | 9th Dec 2015 |
| 103.20.68.0/22 | 1k | APNIC |  CN | 10th Dec 2015 |
| 103.200.110.0/23 | 512 | APNIC | IN | 16th Nov 2015 |
| 103.200.120.0/22 | 1k | APNIC |  VN | 17th Nov 2015 |
| 103.200.152.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.156.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.160.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.164.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.168.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.172.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.176.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.180.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.184.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.188.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.192.0/22 | 1k | APNIC | CN | 17th Nov 2015 |
| 103.200.236.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.200.240.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.200.244.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.200.248.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.200.252.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.200.40.0/22 | 1k | APNIC | IN | 13th Nov 2015 |
| 103.200.48.0/22 | 1k | APNIC | IN | 13th Nov 2015 |
| 103.200.52.0/22 | 1k | APNIC | CN | 13th Nov 2015 |
| 103.200.64.0/22 | 1k | APNIC | CN | 13th Nov 2015 |
| 103.200.68.0/22 | 1k | APNIC | CN | 13th Nov 2015 |
| 103.201.0.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.100.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.104.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.108.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.112.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.116.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.12.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.120.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.152.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.156.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.16.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 103.201.160.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.164.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.168.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.172.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.176.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.180.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.184.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.188.0/22 | 1k | APNIC | CN | 21st Nov 2015 |
| 103.201.20.0/22 | 1k | APNIC | CN | 19th Nov 2015 |