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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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 unannounced space registered through ARIN, largest first.

Unannounced blocks registered through ARIN

30,430 blocks match, ordered by prefix.

Allocated but unannounced blocks, 25401 to 25450 of 30430
Prefix	Addresses	Registry	Country	Allocated
2604:100::/32	4.3B × /64	ARIN	US	18th Mar 2011
2604:1020::/32	4.3B × /64	ARIN	US	13th May 2025
2604:1060::/32	4.3B × /64	ARIN	US	19th May 2025
2604:1080::/32	4.3B × /64	ARIN	US	27th Aug 2012
2604:10::/32	4.3B × /64	ARIN	US	26th Oct 2010
2604:10a0::/32	4.3B × /64	ARIN	US	19th May 2025
2604:10e0::/32	4.3B × /64	ARIN	CA	21st May 2025
2604:1100::/32	4.3B × /64	ARIN	US	22nd Mar 2011
2604:1140::/32	4.3B × /64	ARIN	US	30th Jan 2017
2604:1160::/32	4.3B × /64	ARIN	US	28th May 2025
2604:1180::/32	4.3B × /64	ARIN	US	27th Aug 2012
2604:1200::/32	4.3B × /64	ARIN	US	20th Oct 2010
2604:1240::/32	4.3B × /64	ARIN	US	2nd Feb 2017
2604:1260::/32	4.3B × /64	ARIN	US	4th Jun 2025
2604:12a0::/32	4.3B × /64	ARIN	CA	4th Jun 2025
2604:12c0::/32	4.3B × /64	ARIN	US	3rd Feb 2017
2604:1320::/32	4.3B × /64	ARIN	US	6th Jun 2025
2604:1340::/32	4.3B × /64	ARIN	CA	6th Feb 2017
2604:1360::/32	4.3B × /64	ARIN	US	9th Jun 2025
2604:13c0::/32	4.3B × /64	ARIN	CA	6th Feb 2017
2604:13e0::/32	4.3B × /64	ARIN	US	13th Jun 2025
2604:1400::/32	4.3B × /64	ARIN	PR	17th Jun 2010
2604:140::/32	4.3B × /64	ARIN	BM	19th Dec 2016
2604:1440::/32	4.3B × /64	ARIN	US	7th Feb 2017
2604:14a0::/32	4.3B × /64	ARIN	US	20th Jun 2025
2604:1540::/32	4.3B × /64	ARIN	US	8th Feb 2017
2604:15a0::/32	4.3B × /64	ARIN	US	26th Jun 2025
2604:15c0::/32	4.3B × /64	ARIN	US	9th Feb 2017
2604:160::/32	4.3B × /64	ARIN	CA	23rd Jan 2025
2604:1620::/32	4.3B × /64	ARIN	US	7th Jul 2025
2604:1640::/32	4.3B × /64	ARIN	CA	9th Feb 2017
2604:1660::/32	4.3B × /64	ARIN	US	8th Jul 2025
2604:1680::/32	4.3B × /64	ARIN	CA	6th Sept 2012
2604:16a0::/32	4.3B × /64	ARIN	CA	9th Jul 2025
2604:16c0::/32	4.3B × /64	ARIN	US	10th Feb 2017
2604:16e0::/32	4.3B × /64	ARIN	US	15th Jul 2025
2604:1720::/32	4.3B × /64	ARIN	US	17th Jul 2025
2604:1780::/32	4.3B × /64	ARIN	KY	6th Sept 2012
2604:17a0::/32	4.3B × /64	ARIN	US	21st Jul 2025
2604:17e0::/32	4.3B × /64	ARIN	PR	22nd Jul 2025
2604:1820::/32	4.3B × /64	ARIN	US	23rd Jul 2025
2604:1860::/32	4.3B × /64	ARIN	CA	24th Jul 2025
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