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It is also a snapshot, not a history: a block announced yesterday and withdrawn this morning appears here today.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

26,993 blocks match, ordered by prefix.

Allocated but unannounced blocks, 25201 to 25250 of 26993
Prefix	Addresses	Registry	Country	Allocated
2620:c2:6000::/48	65.5k × /64	ARIN	US	11th Dec 2023
2620:c2::/48	65.5k × /64	ARIN	US	19th Oct 2010
2620:c2:a000::/48	65.5k × /64	ARIN	US	11th Dec 2023
2620:c2:e000::/48	65.5k × /64	ARIN	US	27th Dec 2023
2620:c3:2000::/48	65.5k × /64	ARIN	US	4th Jan 2024
2620:c3:4000::/48	65.5k × /64	ARIN	US	1st Jul 2015
2620:c3:8000::/48	65.5k × /64	ARIN	US	26th Jan 2012
2620:c4:2000::/48	65.5k × /64	ARIN	US	31st Jan 2024
2620:c4:4000::/48	65.5k × /64	ARIN	US	7th Jul 2015
2620:c4:6000::/48	65.5k × /64	ARIN	US	2nd Feb 2024
2620:c5:4000::/48	65.5k × /64	ARIN	US	8th Jul 2015
2620:c5:6000::/48	65.5k × /64	ARIN	US	23rd Feb 2024
2620:c5::/48	65.5k × /64	ARIN	US	7th Mar 2011
2620:c6:2000::/48	65.5k × /64	ARIN	US	12th Mar 2024
2620:c6:4000::/48	65.5k × /64	ARIN	US	9th Jul 2015
2620:c6:6000::/48	65.5k × /64	ARIN	US	25th Mar 2024
2620:c6:8000::/48	65.5k × /64	ARIN	US	7th Feb 2012
2620:c6:c000::/48	65.5k × /64	ARIN	US	9th Jul 2015
2620:c6:e000::/48	65.5k × /64	ARIN	US	17th Apr 2024
2620:c7:2000::/48	65.5k × /64	ARIN	US	22nd Apr 2024
2620:c7:8000::/48	65.5k × /64	ARIN	US	13th Feb 2012
2620:c7::/48	65.5k × /64	ARIN	US	8th Mar 2011
2620:c7:a000::/48	65.5k × /64	ARIN	US	9th May 2024
2620:c7:c000::/48	65.5k × /64	ARIN	US	16th Jul 2015
2620:c8:6000::/48	65.5k × /64	ARIN	US	4th Jun 2024
2620:c8::/48	65.5k × /64	ARIN	US	7th Jul 2026
2620:c8:e000::/48	65.5k × /64	ARIN	US	10th Jun 2024
2620:c9:2000::/48	65.5k × /64	ARIN	US	11th Jun 2024
2620:c9:4000::/48	65.5k × /64	ARIN	US	21st Jul 2015
2620:c9:6000::/48	65.5k × /64	ARIN	US	13th Jun 2024
2620:c9:8000::/48	65.5k × /64	ARIN	US	16th Feb 2012
2620:c9::/48	65.5k × /64	ARIN	US	9th Mar 2011
2620:c9:a000::/48	65.5k × /64	ARIN	US	13th Jun 2024
2620:c9:c000::/48	65.5k × /64	ARIN	US	21st Jul 2015
2620:c:8000::/48	65.5k × /64	ARIN	US	7th Apr 2011
2620:c:a000::/48	65.5k × /64	ARIN	US	27th Oct 2016
2620:c:c000::/48	65.5k × /64	ARIN	US	25th Oct 2012
2620:c:e000::/48	65.5k × /64	ARIN	US	2nd Nov 2016
2620:ca:8000::/48	65.5k × /64	ARIN	US	17th Feb 2012
2620:ca::/48	65.5k × /64	ARIN	US	21st Oct 2010
2620:ca:a000::/48	65.5k × /64	ARIN	US	24th Jun 2024
2620:cb:4000::/48	65.5k × /64	ARIN	US	27th Jul 2015
2620:cb:6000::/48	65.5k × /64	ARIN	US	9th Jul 2024
2620:cb::/44	1M × /64	ARIN	US	9th Mar 2011
2620:cb:a000::/48	65.5k × /64	ARIN	US	11th Jul 2024
2620:cb:c000::/48	65.5k × /64	ARIN	US	27th Jul 2015
2620:cb:e000::/48	65.5k × /64	ARIN	US	19th Jul 2024
2620:cc:2000::/48	65.5k × /64	ARIN	US	22nd Jul 2024
2620:cc:4000::/48	65.5k × /64	ARIN	US	30th Jul 2015
2620:cc::/48	65.5k × /64	ARIN	US	25th May 2010