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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

Browse by country

Countries with unannounced space registered through ARIN, largest first.

Unannounced blocks registered through ARIN

30,441 blocks match, ordered by prefix.

Allocated but unannounced blocks, 25401 to 25450 of 30441
Prefix	Addresses	Registry	Country	Allocated
2604:1880::/32	4.3B × /64	ARIN	US	6th Sept 2012
2604:18a0::/32	4.3B × /64	ARIN	CA	24th Jul 2025
2604:18e0::/32	4.3B × /64	ARIN	CA	24th Jul 2025
2604:1920::/32	4.3B × /64	ARIN	CA	24th Jul 2025
2604:19c0::/32	4.3B × /64	ARIN	US	24th Feb 2017
2604:19e0::/32	4.3B × /64	ARIN	US	30th Jul 2025
2604:1a40::/32	4.3B × /64	ARIN	US	24th Feb 2017
2604:1a60::/32	4.3B × /64	ARIN	US	1st Aug 2025
2604:1a80::/32	4.3B × /64	ARIN	US	18th Sept 2012
2604:1aa0::/32	4.3B × /64	ARIN	US	5th Aug 2025
2604:1ac0::/32	4.3B × /64	ARIN	US	24th Feb 2017
2604:1ae0::/32	4.3B × /64	ARIN	US	6th Aug 2025
2604:1b00::/32	4.3B × /64	ARIN	CA	24th Mar 2011
2604:1b20::/32	4.3B × /64	ARIN	US	6th Aug 2025
2604:1b40::/32	4.3B × /64	ARIN	US	27th Feb 2017
2604:1b60::/32	4.3B × /64	ARIN	US	7th Aug 2025
2604:1b80::/32	4.3B × /64	ARIN	US	20th Sept 2012
2604:1ba0::/32	4.3B × /64	ARIN	US	7th Aug 2025
2604:1c00::/32	4.3B × /64	ARIN	US	17th Jun 2010
2604:1c0::/32	4.3B × /64	ARIN	US	20th Dec 2016
2604:1c80::/32	4.3B × /64	ARIN	US	20th Sept 2012
2604:1d00::/32	4.3B × /64	ARIN	CA	25th Mar 2011
2604:1d60::/32	4.3B × /64	ARIN	US	18th Aug 2025
2604:1d80::/32	4.3B × /64	ARIN	US	21st Sept 2012
2604:1da0::/32	4.3B × /64	ARIN	PR	19th Aug 2025
2604:1de0::/32	4.3B × /64	ARIN	US	19th Aug 2025
2604:1e00::/32	4.3B × /64	ARIN	US	21st Oct 2010
2604:1e0::/32	4.3B × /64	ARIN	US	31st Jan 2025
2604:1e20::/32	4.3B × /64	ARIN	US	21st Aug 2025
2604:1e40::/32	4.3B × /64	ARIN	US	1st Mar 2017
2604:1e60::/32	4.3B × /64	ARIN	US	23rd Aug 2025
2604:1e80::/32	4.3B × /64	ARIN	CA	24th Sept 2012
2604:1ea0::/32	4.3B × /64	ARIN	US	25th Aug 2025
2604:1fa0::/32	4.3B × /64	ARIN	US	4th Sept 2025
2604:1fc0::/32	4.3B × /64	ARIN	US	6th Mar 2017
2604:20e0::/32	4.3B × /64	ARIN	US	18th Sept 2025
2604:2120::/32	4.3B × /64	ARIN	US	19th Sept 2025
2604:2140::/32	4.3B × /64	ARIN	US	7th Mar 2017
2604:2160::/32	4.3B × /64	ARIN	US	22nd Sept 2025
2604:21a0::/32	4.3B × /64	ARIN	US	23rd Sept 2025
2604:21e0::/32	4.3B × /64	ARIN	US	24th Sept 2025
2604:220::/32	4.3B × /64	ARIN	US	31st Jan 2025
2604:2260::/32	4.3B × /64	ARIN	US	25th Sept 2025
2604:22c0::/32	4.3B × /64	ARIN	US	10th Mar 2017
2604:2320::/32	4.3B × /64	ARIN	US	29th Sept 2025
2604:23c0::/32	4.3B × /64	ARIN	CA	16th Mar 2017
2604:2460::/32	4.3B × /64	ARIN	CA	7th Oct 2025
2604:2480::/32	4.3B × /64	ARIN	US	12th Oct 2012
2604:24a0::/32	4.3B × /64	ARIN	US	14th Oct 2025
2604:2520::/32	4.3B × /64	ARIN	US	15th Oct 2025