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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.198.196.0/22 | 1k | APNIC |  CN | 21st Oct 2015 |
| 103.198.20.0/22 | 1k | APNIC | CN | 14th Oct 2015 |
| 103.198.216.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.220.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.224.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.228.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.232.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.236.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.240.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.244.0/22 | 1k | APNIC | CN | 21st Oct 2015 |
| 103.198.248.0/22 | 1k | APNIC |  HK | 21st Oct 2015 |
| 103.198.48.0/22 | 1k | APNIC | HK | 15th Oct 2015 |
| 103.198.64.0/22 | 1k | APNIC | CN | 15th Oct 2015 |
| 103.198.72.0/22 | 1k | APNIC | CN | 15th Oct 2015 |
| 103.198.82.0/24 | 256 | APNIC | HK | 16th Oct 2015 |
| 103.199.118.0/24 | 256 | APNIC |  ID | 26th Oct 2015 |
| 103.199.12.0/22 | 1k | APNIC |  VN | 22nd Oct 2015 |
| 103.199.144.0/22 | 1k | APNIC |  IN | 26th Oct 2015 |
| 103.199.164.0/22 | 1k | APNIC | CN | 27th Oct 2015 |
| 103.199.196.0/22 | 1k | APNIC | CN | 10th Nov 2015 |
| 103.199.220.0/22 | 1k | APNIC |  JP | 11th Nov 2015 |
| 103.199.228.0/22 | 1k | APNIC | CN | 11th Nov 2015 |
| 103.199.236.0/22 | 1k | APNIC | ID | 11th Nov 2015 |
| 103.199.248.0/22 | 1k | APNIC | CN | 12th Nov 2015 |
| 103.199.252.0/22 | 1k | APNIC | CN | 12th Nov 2015 |
| 103.199.56.0/22 | 1k | APNIC | VN | 22nd Oct 2015 |
| 103.199.92.0/22 | 1k | APNIC | IN | 22nd Oct 2015 |
| 103.2.12.0/22 | 1k | APNIC | JP | 20th Apr 2011 |
| 103.2.124.0/22 | 1k | APNIC | JP | 21st Apr 2011 |
| 103.2.156.0/22 | 1k | APNIC | CN | 21st Apr 2011 |
| 103.2.16.0/22 | 1k | APNIC | JP | 20th Apr 2011 |
| 103.2.164.0/22 | 1k | APNIC | CN | 21st Apr 2011 |
| 103.2.172.0/22 | 1k | APNIC |  AU | 21st Apr 2011 |
| 103.2.176.0/22 | 1k | APNIC | AU | 21st Apr 2011 |
| 103.2.188.0/23 | 512 | APNIC | CN | 24th Apr 2023 |
| 103.2.190.0/23 | 512 | APNIC | IN | 25th Apr 2023 |
| 103.2.200.0/22 | 1k | APNIC | CN | 27th Apr 2011 |
| 103.2.204.0/22 | 1k | APNIC | CN | 27th Apr 2011 |
| 103.2.212.0/22 | 1k | APNIC | CN | 27th Apr 2011 |
| 103.2.216.0/22 | 1k | APNIC |  TW | 27th Apr 2011 |
| 103.2.40.0/22 | 1k | APNIC | JP | 20th Apr 2011 |
| 103.2.56.0/24 | 256 | APNIC | JP | 20th Apr 2011 |
| 103.2.72.0/22 | 1k | APNIC | JP | 20th Apr 2011 |
| 103.2.76.0/22 | 1k | APNIC |  KR | 20th Apr 2011 |
| 103.2.84.0/22 | 1k | APNIC | KR | 20th Apr 2011 |
| 103.20.100.0/24 | 256 | APNIC | AU | 24th Aug 2023 |
| 103.20.106.0/23 | 512 | APNIC | ID | 14th Sept 2012 |
| 103.20.12.0/22 | 1k | APNIC | CN | 6th Sept 2012 |
| 103.20.148.0/22 | 1k | APNIC | VN | 17th Sept 2012 |
| 103.20.165.0/24 | 256 | APNIC | HK | 19th Sept 2012 |