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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

26,249 blocks match, ordered by prefix.

Allocated but unannounced blocks, 21951 to 22000 of 26249
Prefix	Addresses	Registry	Country	Allocated
2604:800::/32	4.3B × /64	ARIN	US	13th Apr 2010
2604:8040::/32	4.3B × /64	ARIN	US	13th Nov 2017
2604:8080::/32	4.3B × /64	ARIN	US	8th Oct 2026
2604:80c0::/32	4.3B × /64	ARIN	US	15th Nov 2017
2604:8180::/31	8.6B × /64	ARIN	US	4th Feb 2014
2604:83c0::/32	4.3B × /64	ARIN	US	22nd Nov 2017
2604:860::/32	4.3B × /64	ARIN	US	14th Mar 2025
2604:8640::/32	4.3B × /64	ARIN	US	30th Nov 2017
2604:8680::/32	4.3B × /64	ARIN	US	13th Oct 2026
2604:8700::/36	268M × /64	ARIN	US	26th Apr 2011
2604:8780::/32	4.3B × /64	ARIN	US	7th Mar 2013
2604:87c0::/32	4.3B × /64	ARIN	US	4th Dec 2017
2604:8840::/32	4.3B × /64	ARIN	US	5th Dec 2017
2604:88c0::/32	4.3B × /64	ARIN	US	5th Dec 2017
2604:8940::/32	4.3B × /64	ARIN	US	7th Dec 2017
2604:8a40::/32	4.3B × /64	ARIN	US	8th Dec 2017
2604:8a80::/32	4.3B × /64	ARIN	US	13th Oct 2026
2604:8ac0::/32	4.3B × /64	ARIN	US	12th Dec 2017
2604:8b40::/32	4.3B × /64	ARIN	US	14th Oct 2026
2604:8bc0::/32	4.3B × /64	ARIN	US	14th Dec 2017
2604:8cc0::/32	4.3B × /64	ARIN	US	19th Dec 2017
2604:8e00::/32	4.3B × /64	ARIN	US	21st Jan 2026
2604:8e40::/32	4.3B × /64	ARIN	US	21st Dec 2017
2604:9040::/32	4.3B × /64	ARIN	US	27th Dec 2017
2604:90c0::/32	4.3B × /64	ARIN	US	28th Dec 2017
2604:9140::/32	4.3B × /64	ARIN	US	28th Dec 2017
2604:91c0::/32	4.3B × /64	ARIN	US	29th Dec 2017
2604:9280::/32	4.3B × /64	ARIN	US	19th Mar 2013
2604:92c0::/32	4.3B × /64	ARIN	US	10th Jan 2018
2604:9300::/32	4.3B × /64	ARIN	US	27th Apr 2011
2604:9340::/32	4.3B × /64	ARIN	US	11th Jan 2018
2604:93c0::/32	4.3B × /64	ARIN	US	11th Jan 2018
2604:9480::/32	4.3B × /64	ARIN	US	21st Mar 2013
2604:9580::/32	4.3B × /64	ARIN	US	22nd Jul 2014
2604:9600::/32	4.3B × /64	ARIN	US	18th Nov 2010
2604:9640::/32	4.3B × /64	ARIN	US	19th Jan 2018
2604:9680::/32	4.3B × /64	ARIN	US	28th Jan 2026
2604:96c0::/32	4.3B × /64	ARIN	US	19th Jan 2018
2604:9700::/32	4.3B × /64	ARIN	US	27th Apr 2011
2604:9740::/32	4.3B × /64	ARIN	US	22nd Jan 2018
2604:97c0::/32	4.3B × /64	ARIN	US	23rd Jan 2018
2604:9940::/32	4.3B × /64	ARIN	US	23rd Jan 2018
2604:9a80::/32	4.3B × /64	ARIN	US	28th Mar 2013
2604:9ac0::/32	4.3B × /64	ARIN	US	25th Jan 2018
2604:9b80::/32	4.3B × /64	ARIN	US	28th Mar 2013
2604:9bc0::/32	4.3B × /64	ARIN	US	26th Jan 2018
2604:9c00::/32	4.3B × /64	ARIN	US	2nd Jul 2010
2604:9c40::/32	4.3B × /64	ARIN	US	29th Jan 2018
2604:9c80::/32	4.3B × /64	ARIN	US	29th Mar 2013
2604:9d00::/32	4.3B × /64	ARIN	US	29th Apr 2011