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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
84,818 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 103.181.12.0/23 | 512 | APNIC |  HK | 2nd Feb 2022 |
| 103.181.130.0/23 | 512 | APNIC |  AU | 11th Feb 2022 |
| 103.181.18.0/24 | 256 | APNIC |  NZ | 3rd Feb 2022 |
| 103.181.195.0/24 | 256 | APNIC |  ID | 15th Feb 2022 |
| 103.181.236.0/23 | 512 | APNIC |  IN | 16th Feb 2022 |
| 103.181.38.0/23 | 512 | APNIC | IN | 3rd Feb 2022 |
| 103.181.82.0/23 | 512 | APNIC | ID | 7th Feb 2022 |
| 103.181.94.0/23 | 512 | APNIC | IN | 8th Feb 2022 |
| 103.182.108.0/23 | 512 | APNIC | IN | 22nd Feb 2022 |
| 103.182.136.0/23 | 512 | APNIC | ID | 23rd Feb 2022 |
| 103.182.172.0/24 | 256 | APNIC |  MV | 25th Feb 2022 |
| 103.182.178.0/23 | 512 | APNIC | IN | 25th Feb 2022 |
| 103.182.198.0/23 | 512 | APNIC | IN | 28th Feb 2022 |
| 103.182.99.0/24 | 256 | APNIC | ID | 22nd Feb 2022 |
| 103.183.111.0/24 | 256 | APNIC | AU | 10th Mar 2022 |
| 103.183.154.0/23 | 512 | APNIC |  TW | 11th Mar 2022 |
| 103.183.208.0/23 | 512 | APNIC | IN | 14th Mar 2022 |
| 103.183.252.0/24 | 256 | APNIC | ID | 16th Mar 2022 |
| 103.183.26.0/23 | 512 | APNIC |  CN | 3rd Mar 2022 |
| 103.183.36.0/23 | 512 | APNIC | IN | 3rd Mar 2022 |
| 103.183.41.0/24 | 256 | APNIC | AU | 7th Mar 2022 |
| 103.183.76.0/23 | 512 | APNIC |  JP | 8th Mar 2022 |
| 103.183.88.0/23 | 512 | APNIC | IN | 8th Mar 2022 |
| 103.184.118.0/23 | 512 | APNIC | IN | 23rd Mar 2022 |
| 103.184.130.0/23 | 512 | APNIC | IN | 23rd Mar 2022 |
| 103.184.192.0/23 | 512 | APNIC | IN | 25th Mar 2022 |
| 103.184.204.0/24 | 256 | APNIC | IN | 25th Mar 2022 |
| 103.184.253.0/24 | 256 | APNIC | AU | 27th Mar 2022 |
| 103.184.30.0/23 | 512 | APNIC | ID | 18th Mar 2022 |
| 103.184.36.0/23 | 512 | APNIC | IN | 21st Mar 2022 |
| 103.184.48.0/23 | 512 | APNIC | ID | 22nd Mar 2022 |
| 103.184.58.0/23 | 512 | APNIC |  PK | 22nd Mar 2022 |
| 103.184.60.0/23 | 512 | APNIC | CN | 22nd Mar 2022 |
| 103.184.76.0/23 | 512 | APNIC | IN | 22nd Mar 2022 |
| 103.185.196.0/24 | 256 | APNIC | ID | 31st Mar 2022 |
| 103.185.198.0/23 | 512 | APNIC | IN | 31st Mar 2022 |
| 103.185.200.0/23 | 512 | APNIC | IN | 31st Mar 2022 |
| 103.185.208.0/23 | 512 | APNIC | IN | 31st Mar 2022 |
| 103.185.213.0/24 | 256 | APNIC | IN | 31st Mar 2022 |
| 103.185.252.0/23 | 512 | APNIC | ID | 6th Apr 2022 |
| 103.185.48.0/23 | 512 | APNIC | ID | 28th Mar 2022 |
| 103.185.78.0/23 | 512 | APNIC | CN | 28th Mar 2022 |
| 103.185.80.0/23 | 512 | APNIC | CN | 29th Mar 2022 |
| 103.186.111.0/24 | 256 | APNIC | IN | 19th Apr 2022 |
| 103.186.13.0/24 | 256 | APNIC | AU | 8th Apr 2022 |
| 103.186.130.0/23 | 512 | APNIC | IN | 19th Apr 2022 |
| 103.186.140.0/23 | 512 | APNIC | ID | 20th Apr 2022 |
| 103.186.146.0/23 | 512 | APNIC |  VN | 20th Apr 2022 |
| 103.186.157.0/24 | 256 | APNIC |  PH | 21st Apr 2022 |
| 103.186.158.0/23 | 512 | APNIC | CN | 21st Apr 2022 |