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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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.
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Countries with the most unannounced blocks, largest first.
Unannounced blocks
84,738 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.100.56.0/22 | 1k | APNIC |  CN | 5th Sept 2017 |
| 103.100.8.0/23 | 512 | APNIC |  IN | 31st Aug 2017 |
| 103.100.85.0/24 | 256 | APNIC |  ID | 6th Sept 2017 |
| 103.100.88.0/22 | 1k | APNIC | CN | 6th Sept 2017 |
| 103.101.12.0/22 | 1k | APNIC | CN | 14th Sept 2017 |
| 103.101.120.0/22 | 1k | APNIC | CN | 26th Sept 2017 |
| 103.101.135.0/24 | 256 | APNIC |  AU | 26th Sept 2017 |
| 103.101.140.0/23 | 512 | APNIC | ID | 2nd Mar 2023 |
| 103.101.144.0/22 | 1k | APNIC | CN | 27th Sept 2017 |
| 103.101.148.0/22 | 1k | APNIC | CN | 27th Sept 2017 |
| 103.101.154.0/23 | 512 | APNIC | ID | 27th Sept 2017 |
| 103.101.173.0/24 | 256 | APNIC | AU | 28th Sept 2017 |
| 103.101.184.0/22 | 1k | APNIC | CN | 28th Sept 2017 |
| 103.101.20.0/22 | 1k | APNIC | ID | 14th Sept 2017 |
| 103.101.252.0/24 | 256 | APNIC |  NP | 6th Oct 2017 |
| 103.101.60.0/22 | 1k | APNIC | CN | 19th Sept 2017 |
| 103.101.65.0/24 | 256 | APNIC | IN | 30th Nov 2022 |
| 103.101.66.0/23 | 512 | APNIC | ID | 19th Sept 2017 |
| 103.101.72.0/22 | 1k | APNIC |  JP | 20th Sept 2017 |
| 103.101.8.0/22 | 1k | APNIC | CN | 14th Sept 2017 |
| 103.101.95.0/24 | 256 | APNIC | ID | 26th Sept 2017 |
| 103.102.106.0/23 | 512 | APNIC | IN | 13th Oct 2017 |
| 103.102.168.0/22 | 1k | APNIC | CN | 19th Oct 2017 |
| 103.102.172.0/22 | 1k | APNIC | CN | 19th Oct 2017 |
| 103.102.180.0/22 | 1k | APNIC | CN | 23rd Oct 2017 |
| 103.102.184.0/22 | 1k | APNIC | CN | 23rd Oct 2017 |
| 103.102.188.0/22 | 1k | APNIC | CN | 23rd Oct 2017 |
| 103.102.192.0/22 | 1k | APNIC | CN | 23rd Oct 2017 |
| 103.102.2.0/24 | 256 | APNIC | IN | 9th Oct 2017 |
| 103.102.20.0/22 | 1k | APNIC |  VN | 10th Oct 2017 |
| 103.102.208.0/22 | 1k | APNIC | CN | 23rd Oct 2017 |
| 103.102.220.0/24 | 256 | APNIC |  AF | 24th Oct 2017 |
| 103.102.221.0/24 | 256 | APNIC | AF | 24th Oct 2017 |
| 103.102.251.0/24 | 256 | APNIC | IN | 25th Oct 2017 |
| 103.102.53.0/24 | 256 | APNIC | AU | 12th Oct 2017 |
| 103.102.76.0/22 | 1k | APNIC | CN | 12th Oct 2017 |
| 103.102.80.0/22 | 1k | APNIC | CN | 12th Oct 2017 |
| 103.103.114.0/24 | 256 | APNIC | AU | 7th Nov 2017 |
| 103.103.16.0/22 | 1k | APNIC | CN | 27th Oct 2017 |
| 103.103.188.0/22 | 1k | APNIC | CN | 10th Nov 2017 |
| 103.103.200.0/22 | 1k | APNIC | CN | 10th Nov 2017 |
| 103.103.204.0/22 | 1k | APNIC | CN | 10th Nov 2017 |
| 103.103.218.0/24 | 256 | APNIC |  NZ | 13th Nov 2017 |
| 103.103.220.0/22 | 1k | APNIC | CN | 13th Nov 2017 |
| 103.103.224.0/21 | 2k | APNIC | CN | 13th Nov 2017 |
| 103.103.232.0/22 | 1k | APNIC | CN | 13th Nov 2017 |
| 103.103.24.0/22 | 1k | APNIC | ID | 27th Oct 2017 |
| 103.103.248.0/21 | 2k | APNIC | CN | 14th Nov 2017 |
| 103.103.30.0/23 | 512 | APNIC | ID | 27th Oct 2017 |
| 103.103.55.0/24 | 256 | APNIC | IN | 31st Oct 2017 |