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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 |
|---|---|---|---|---|
| 103.27.248.0/22 | 1k | APNIC |  ID | 10th Jul 2013 |
| 103.27.3.0/24 | 256 | APNIC | ID | 27th Jun 2013 |
| 103.27.40.0/22 | 1k | APNIC |  JP | 1st Jul 2013 |
| 103.27.44.0/22 | 1k | APNIC |  US | 1st Jul 2013 |
| 103.27.56.0/22 | 1k | APNIC |  CN | 1st Jul 2013 |
| 103.27.88.0/22 | 1k | APNIC |  NZ | 2nd Jul 2013 |
| 103.27.92.0/22 | 1k | APNIC |  AU | 2nd Jul 2013 |
| 103.27.96.0/22 | 1k | APNIC | CN | 2nd Jul 2013 |
| 103.28.104.0/24 | 256 | APNIC | ID | 23rd Dec 2011 |
| 103.28.124.0/22 | 1k | APNIC |  TH | 28th Dec 2011 |
| 103.28.172.0/22 | 1k | APNIC |  VN | 6th Jan 2012 |
| 103.28.184.0/22 | 1k | APNIC | CN | 23rd Jun 2016 |
| 103.28.192.0/22 | 1k | APNIC | ID | 9th Jan 2012 |
| 103.28.228.0/22 | 1k | APNIC | JP | 11th Jan 2012 |
| 103.28.4.0/22 | 1k | APNIC | CN | 13th Dec 2011 |
| 103.28.44.0/22 | 1k | APNIC |  HK | 16th Dec 2011 |
| 103.28.74.0/23 | 512 | APNIC | ID | 22nd Dec 2011 |
| 103.29.108.0/22 | 1k | APNIC |  SG | 24th Jun 2011 |
| 103.29.112.0/24 | 256 | APNIC | AU | 27th Jun 2011 |
| 103.29.113.0/24 | 256 | APNIC | JP | 29th Jun 2011 |
| 103.29.12.0/22 | 1k | APNIC | HK | 30th May 2011 |
| 103.29.128.0/22 | 1k | APNIC | CN | 5th Aug 2011 |
| 103.29.132.0/22 | 1k | APNIC | CN | 8th Aug 2011 |
| 103.29.160.0/23 | 512 | APNIC | AU | 9th Aug 2011 |
| 103.29.186.0/24 | 256 | APNIC | ID | 12th Aug 2011 |
| 103.29.199.0/24 | 256 | APNIC |  MN | 19th Aug 2011 |
| 103.29.208.0/22 | 1k | APNIC |  IN | 15th Aug 2011 |
| 103.29.228.0/22 | 1k | APNIC | ID | 18th Aug 2011 |
| 103.29.232.0/22 | 1k | APNIC | IN | 19th Aug 2011 |
| 103.29.236.0/23 | 512 | APNIC | CN | 1st Nov 2022 |
| 103.29.240.0/22 | 1k | APNIC |  MY | 19th Aug 2011 |
| 103.29.36.0/22 | 1k | APNIC | IN | 12th May 2011 |
| 103.29.43.0/24 | 256 | APNIC | AU | 13th May 2011 |
| 103.29.72.0/22 | 1k | APNIC | HK | 22nd Jun 2011 |
| 103.29.80.0/23 | 512 | APNIC | IN | 31st Oct 2022 |
| 103.3.100.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.3.104.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.3.108.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.3.132.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.3.148.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.3.180.0/22 | 1k | APNIC | JP | 3rd May 2011 |
| 103.3.28.0/22 | 1k | APNIC |  KH | 28th Oct 2015 |
| 103.3.56.0/23 | 512 | APNIC | ID | 28th Apr 2011 |
| 103.3.8.0/22 | 1k | APNIC | JP | 27th Apr 2011 |
| 103.3.84.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.3.88.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.3.92.0/22 | 1k | APNIC | CN | 29th Apr 2011 |
| 103.30.104.0/23 | 512 | APNIC | CN | 4th Nov 2022 |
| 103.30.106.0/23 | 512 | APNIC | CN | 4th Nov 2022 |
| 103.30.108.0/22 | 1k | APNIC |  KR | 2nd Nov 2012 |