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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

30,441 blocks match, ordered by prefix.

Allocated but unannounced blocks, 25451 to 25500 of 30441
Prefix	Addresses	Registry	Country	Allocated
2604:2580::/32	4.3B × /64	ARIN	CA	15th Oct 2012
2604:25a0::/32	4.3B × /64	ARIN	US	16th Oct 2025
2604:25e0::/32	4.3B × /64	ARIN	MF	21st Oct 2025
2604:2660::/32	4.3B × /64	ARIN	US	22nd Oct 2025
2604:2680::/32	4.3B × /64	ARIN	US	15th Oct 2012
2604:2720::/32	4.3B × /64	ARIN	US	29th Oct 2025
2604:2740::/32	4.3B × /64	ARIN	US	21st Mar 2017
2604:2760::/32	4.3B × /64	ARIN	US	31st Oct 2025
2604:2780::/32	4.3B × /64	ARIN	US	15th Oct 2012
2604:27a0::/32	4.3B × /64	ARIN	US	3rd Nov 2025
2604:27c0::/32	4.3B × /64	ARIN	US	21st Mar 2017
2604:27e0::/32	4.3B × /64	ARIN	US	4th Nov 2025
2604:2840::/32	4.3B × /64	ARIN	CA	21st Mar 2017
2604:2860::/32	4.3B × /64	ARIN	US	13th Nov 2025
2604:28a0::/32	4.3B × /64	ARIN	US	14th Nov 2025
2604:28c0::/32	4.3B × /64	ARIN	US	23rd Mar 2017
2604:28e0::/32	4.3B × /64	ARIN	US	14th Nov 2025
2604:2920::/32	4.3B × /64	ARIN	US	18th Nov 2025
2604:2a60::/32	4.3B × /64	ARIN	US	19th Nov 2025
2604:2ae0::/32	4.3B × /64	ARIN	US	24th Nov 2025
2604:2b00::/32	4.3B × /64	ARIN	US	29th Mar 2011
2604:2b20::/32	4.3B × /64	ARIN	US	25th Nov 2025
2604:2b60::/32	4.3B × /64	ARIN	US	25th Nov 2025
2604:2ba0::/32	4.3B × /64	ARIN	VG	26th Nov 2025
2604:2be0::/32	4.3B × /64	ARIN	US	26th Nov 2025
2604:2c0::/32	4.3B × /64	ARIN	US	27th Dec 2016
2604:2c60::/32	4.3B × /64	ARIN	US	4th Dec 2025
2604:2c80::/32	4.3B × /64	ARIN	US	25th Oct 2012
2604:2cc0::/32	4.3B × /64	ARIN	US	30th Mar 2017
2604:2ce0::/32	4.3B × /64	ARIN	US	9th Dec 2025
2604:2d20::/32	4.3B × /64	ARIN	US	11th Dec 2025
2604:2d40::/32	4.3B × /64	ARIN	PR	31st Mar 2017
2604:2e0::/32	4.3B × /64	ARIN	US	10th Feb 2025
2604:2e40::/32	4.3B × /64	ARIN	US	3rd Apr 2017
2604:2f00::/32	4.3B × /64	ARIN	US	29th Mar 2011
2604:3100::/32	4.3B × /64	ARIN	US	29th Mar 2011
2604:3140::/32	4.3B × /64	ARIN	US	11th Apr 2017
2604:3180::/32	4.3B × /64	ARIN	US	2nd Nov 2012
2604:31c0::/32	4.3B × /64	ARIN	US	12th Apr 2017
2604:3240::/32	4.3B × /64	ARIN	US	12th Apr 2017
2604:3300::/32	4.3B × /64	ARIN	US	31st Mar 2011
2604:3340::/32	4.3B × /64	ARIN	US	14th Apr 2017
2604:33c0::/32	4.3B × /64	ARIN	US	17th Apr 2017
2604:3480::/32	4.3B × /64	ARIN	US	8th Nov 2012
2604:34c0::/32	4.3B × /64	ARIN	US	19th Apr 2017
2604:3580::/32	4.3B × /64	ARIN	US	8th Nov 2012
2604:35c0::/32	4.3B × /64	ARIN	US	2nd Jan 2026
2604:3600::/32	4.3B × /64	ARIN	US	26th Oct 2010
2604:360::/32	4.3B × /64	ARIN	US	12th Feb 2025
2604:3640::/32	4.3B × /64	ARIN	US	20th Apr 2017