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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,954 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.39.164.0/22 | 1k | APNIC |  CN | 24th Sept 2014 |
| 103.39.168.0/22 | 1k | APNIC | CN | 24th Sept 2014 |
| 103.39.172.0/22 | 1k | APNIC | CN | 24th Sept 2014 |
| 103.39.176.0/22 | 1k | APNIC | CN | 24th Sept 2014 |
| 103.39.180.0/22 | 1k | APNIC | CN | 24th Sept 2014 |
| 103.39.184.0/22 | 1k | APNIC | CN | 24th Sept 2014 |
| 103.39.188.0/22 | 1k | APNIC | CN | 24th Sept 2014 |
| 103.39.250.0/24 | 256 | APNIC |  AU | 26th Sept 2014 |
| 103.39.36.0/22 | 1k | APNIC |  KR | 16th Sept 2014 |
| 103.39.52.0/24 | 256 | APNIC |  ID | 18th Sept 2014 |
| 103.39.7.0/24 | 256 | APNIC |  SG | 17th Sept 2014 |
| 103.39.86.0/23 | 512 | APNIC | AU | 22nd Sept 2014 |
| 103.39.88.0/22 | 1k | APNIC | CN | 19th Sept 2014 |
| 103.39.96.0/22 | 1k | APNIC |  VN | 19th Sept 2014 |
| 103.4.120.0/24 | 256 | APNIC | AU | 7th Jun 2011 |
| 103.4.148.0/22 | 1k | APNIC | KR | 8th Jul 2011 |
| 103.4.168.0/22 | 1k | APNIC | CN | 13th Jul 2011 |
| 103.4.184.0/22 | 1k | APNIC | CN | 13th Jul 2011 |
| 103.4.204.0/24 | 256 | APNIC |  IN | 14th Jul 2011 |
| 103.4.208.0/22 | 1k | APNIC | IN | 15th Jul 2011 |
| 103.4.212.0/22 | 1k | APNIC | AU | 15th Jul 2011 |
| 103.4.224.0/22 | 1k | APNIC | CN | 29th Oct 2015 |
| 103.4.56.0/22 | 1k | APNIC | CN | 19th May 2011 |
| 103.40.0.0/23 | 512 | APNIC | ID | 17th Nov 2022 |
| 103.40.108.0/24 | 256 | APNIC | ID | 2nd Oct 2014 |
| 103.40.158.0/23 | 512 | APNIC | CN | 18th Nov 2022 |
| 103.40.16.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.168.0/22 | 1k | APNIC | IN | 8th Oct 2014 |
| 103.40.20.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.212.0/22 | 1k | APNIC | CN | 9th Oct 2014 |
| 103.40.216.0/22 | 1k | APNIC |  JP | 9th Oct 2014 |
| 103.40.220.0/22 | 1k | APNIC | CN | 9th Oct 2014 |
| 103.40.228.0/22 | 1k | APNIC | CN | 11th Oct 2014 |
| 103.40.236.0/22 | 1k | APNIC | CN | 11th Oct 2014 |
| 103.40.24.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.28.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.32.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.36.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.40.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.44.0/22 | 1k | APNIC | CN | 26th Sept 2014 |
| 103.40.56.0/22 | 1k | APNIC | IN | 29th Sept 2014 |
| 103.40.68.0/23 | 512 | APNIC | ID | 29th Sept 2014 |
| 103.40.88.0/22 | 1k | APNIC | CN | 30th Sept 2014 |
| 103.40.95.0/24 | 256 | APNIC | ID | 1st Oct 2014 |
| 103.41.10.0/24 | 256 | APNIC | IN | 13th Oct 2014 |
| 103.41.12.0/22 | 1k | APNIC | SG | 13th Oct 2014 |
| 103.41.124.0/22 | 1k | APNIC |  HK | 21st Oct 2014 |
| 103.41.140.0/22 | 1k | APNIC | CN | 21st Oct 2014 |
| 103.41.148.0/22 | 1k | APNIC | CN | 21st Oct 2014 |
| 103.41.152.0/22 | 1k | APNIC | CN | 21st Oct 2014 |