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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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
85,075 blocks match, ordered by prefix.
| Prefix | Addresses | Registry | Country | Allocated |
|---|---|---|---|---|
| 180.210.16.0/21 | 2k | APNIC |  KR | 25th Sept 2009 |
| 180.210.216.0/22 | 1k | APNIC |  TH | 30th Sept 2009 |
| 180.210.24.0/22 | 1k | APNIC | KR | 25th Sept 2009 |
| 180.210.28.0/22 | 1k | APNIC | KR | 25th Sept 2009 |
| 180.210.32.0/21 | 2k | APNIC | KR | 25th Sept 2009 |
| 180.210.40.0/22 | 1k | APNIC | KR | 25th Sept 2009 |
| 180.210.44.0/22 | 1k | APNIC | KR | 25th Sept 2009 |
| 180.210.48.0/21 | 2k | APNIC | KR | 25th Sept 2009 |
| 180.210.56.0/22 | 1k | APNIC | KR | 25th Sept 2009 |
| 180.210.8.0/21 | 2k | APNIC | KR | 25th Sept 2009 |
| 180.211.80.0/22 | 1k | APNIC |  IN | 1st Oct 2009 |
| 180.215.0.0/16 | 65.5k | APNIC |  SG | 1st Oct 2009 |
| 180.217.0.0/16 | 65.5k | APNIC |  TW | 6th Oct 2009 |
| 180.222.204.0/22 | 1k | APNIC | SG | 15th Oct 2009 |
| 180.222.216.0/22 | 1k | APNIC |  ID | 21st Oct 2009 |
| 180.222.224.0/19 | 8.2k | APNIC |  CN | 15th Oct 2009 |
| 180.233.144.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 180.233.64.0/19 | 8.2k | APNIC | CN | 16th Oct 2009 |
| 180.235.112.0/22 | 1k | APNIC | CN | 30th Nov 2015 |
| 180.235.136.0/22 | 1k | APNIC |  HK | 3rd Nov 2015 |
| 180.235.96.0/21 | 2k | APNIC |  JP | 2nd Nov 2009 |
| 180.236.0.0/14 | 262k | APNIC | KR | 26th Oct 2009 |
| 180.86.0.0/16 | 65.5k | APNIC | CN | 17th Jul 2009 |
| 180.92.200.0/21 | 2k | APNIC | IN | 24th Jul 2009 |
| 180.94.120.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 180.94.124.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 180.94.220.0/22 | 1k | APNIC |  AU | 5th Aug 2009 |
| 180.94.30.0/23 | 512 | APNIC | TW | 23rd Nov 2023 |
| 180.94.56.0/21 | 2k | APNIC | CN | 4th Aug 2009 |
| 180.94.96.0/20 | 4.1k | APNIC | CN | 4th Aug 2009 |
| 181.189.48.0/22 | 1k | LACNIC |  BR | 7th Dec 2021 |
| 181.189.84.0/22 | 1k | LACNIC | BR | 8th Dec 2021 |
| 181.199.172.0/22 | 1k | LACNIC |  AR | 22nd Jul 2013 |
| 181.199.192.0/20 | 4.1k | LACNIC |  MX | 23rd Jul 2013 |
| 181.200.0.0/16 | 65.5k | ARIN |  CA | 16th Jul 2026 |
| 181.203.0.0/16 | 65.5k | ARIN | CA | 16th Jul 2026 |
| 181.224.160.0/22 | 1k | LACNIC |  CO | 2nd May 2013 |
| 181.224.164.0/23 | 512 | LACNIC |  UY | 11th Apr 2013 |
| 181.232.0.0/17 | 32.8k | LACNIC | CO | 21st Nov 2012 |
| 181.233.158.0/24 | 256 | LACNIC |  PY | 14th Dec 2021 |
| 181.233.192.0/18 | 16.4k | LACNIC |  PE | 6th Dec 2012 |
| 182.16.144.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 182.16.148.0/22 | 1k | APNIC | CN | 19th Nov 2015 |
| 182.16.192.0/19 | 8.2k | APNIC | CN | 4th Feb 2010 |
| 182.160.64.0/19 | 8.2k | APNIC | CN | 31st Mar 2010 |
| 182.161.32.0/22 | 1k | APNIC | HK | 14th Nov 2017 |
| 182.161.80.0/20 | 4.1k | APNIC |  VN | 9th Apr 2010 |
| 182.173.180.0/22 | 1k | APNIC | KR | 16th Apr 2010 |
| 182.23.184.0/21 | 2k | APNIC | CN | 12th Apr 2011 |
| 182.23.200.0/21 | 2k | APNIC | CN | 12th Apr 2011 |