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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,783 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.161.94.0/23 | 512 | APNIC |  IN | 6th Jan 2021 |
| 103.162.116.0/23 | 512 | APNIC |  CN | 4th Feb 2021 |
| 103.162.119.0/24 | 256 | APNIC |  NZ | 4th Feb 2021 |
| 103.162.140.0/24 | 256 | APNIC | IN | 5th Feb 2021 |
| 103.162.174.0/23 | 512 | APNIC |  MY | 9th Feb 2021 |
| 103.162.179.0/24 | 256 | APNIC | IN | 9th Feb 2021 |
| 103.162.182.0/24 | 256 | APNIC | IN | 9th Feb 2021 |
| 103.162.183.0/24 | 256 | APNIC |  ID | 10th Feb 2021 |
| 103.162.254.0/24 | 256 | APNIC |  SG | 17th Feb 2021 |
| 103.162.28.0/23 | 512 | APNIC |  VN | 26th Jan 2021 |
| 103.162.32.0/23 | 512 | APNIC | CN | 26th Jan 2021 |
| 103.162.6.0/24 | 256 | APNIC |  HK | 22nd Jan 2021 |
| 103.162.7.0/24 | 256 | APNIC | HK | 22nd Jan 2021 |
| 103.162.76.0/23 | 512 | APNIC | IN | 29th Jan 2021 |
| 103.162.82.0/24 | 256 | APNIC |  BN | 31st Jan 2021 |
| 103.162.9.0/24 | 256 | APNIC | IN | 25th Jan 2021 |
| 103.162.96.0/23 | 512 | APNIC |  AU | 3rd Feb 2021 |
| 103.162.98.0/23 | 512 | APNIC | VN | 3rd Feb 2021 |
| 103.163.114.0/24 | 256 | APNIC | IN | 25th Feb 2021 |
| 103.163.115.0/24 | 256 | APNIC | ID | 26th Feb 2021 |
| 103.163.122.0/23 | 512 | APNIC | VN | 26th Feb 2021 |
| 103.163.136.0/24 | 256 | APNIC | ID | 26th Feb 2021 |
| 103.163.137.0/24 | 256 | APNIC |  NP | 1st Mar 2021 |
| 103.163.146.0/23 | 512 | APNIC | IN | 26th Feb 2021 |
| 103.163.176.0/24 | 256 | APNIC | ID | 2nd Mar 2021 |
| 103.163.20.0/24 | 256 | APNIC | MY | 18th Feb 2021 |
| 103.163.204.0/23 | 512 | APNIC | IN | 3rd Mar 2021 |
| 103.163.212.0/23 | 512 | APNIC | VN | 4th Mar 2021 |
| 103.163.228.0/23 | 512 | APNIC | ID | 4th Mar 2021 |
| 103.163.234.0/23 | 512 | APNIC | IN | 4th Mar 2021 |
| 103.163.252.0/23 | 512 | APNIC | HK | 8th Mar 2021 |
| 103.163.28.0/23 | 512 | APNIC | CN | 18th Feb 2021 |
| 103.163.32.0/23 | 512 | APNIC | CN | 19th Feb 2021 |
| 103.163.54.0/23 | 512 | APNIC | IN | 22nd Feb 2021 |
| 103.163.6.0/23 | 512 | APNIC | ID | 17th Feb 2021 |
| 103.163.74.0/23 | 512 | APNIC | CN | 23rd Feb 2021 |
| 103.163.78.0/23 | 512 | APNIC | NZ | 23rd Feb 2021 |
| 103.163.82.0/23 | 512 | APNIC | ID | 24th Feb 2021 |
| 103.163.84.0/23 | 512 | APNIC | ID | 24th Feb 2021 |
| 103.163.86.0/23 | 512 | APNIC | ID | 24th Feb 2021 |
| 103.163.88.0/23 | 512 | APNIC | ID | 24th Feb 2021 |
| 103.163.92.0/23 | 512 | APNIC | IN | 24th Feb 2021 |
| 103.164.148.0/23 | 512 | APNIC | ID | 19th Mar 2021 |
| 103.164.152.0/23 | 512 | APNIC | VN | 19th Mar 2021 |
| 103.164.154.0/23 | 512 | APNIC | VN | 19th Mar 2021 |
| 103.164.159.0/24 | 256 | APNIC | MY | 22nd Mar 2021 |
| 103.164.164.0/23 | 512 | APNIC | VN | 22nd Mar 2021 |
| 103.164.178.0/23 | 512 | APNIC | CN | 23rd Mar 2021 |
| 103.164.186.0/23 | 512 | APNIC | ID | 23rd Mar 2021 |
| 103.164.4.0/23 | 512 | APNIC | CN | 10th Mar 2021 |