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	Prefix	Description
	199.6.0.0/24	Internet Systems Consortium, Inc.
	2001:500:71::/48	Internet Systems Consortium, Inc.

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS6939	Hurricane Electric LLC	✔	✔
	AS1299	Arelion (fka. Telia Carrier)	✔	✔
	AS6453	TATA Communications (America) Inc	✔	✔

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Peers

	ASN	Description	IPv4	IPv6
	AS6939	Hurricane Electric LLC	✔	✔
	AS24406	China Internet Network Infomation Center	✔	✔
	AS1299	Arelion (fka. Telia Carrier)	✔	✔
	AS3557	ISC - F-root	✔	✔
	AS6453	TATA Communications (America) Inc	✔	✔
	AS199524	Gcore S.A.	✔	✔
	AS137409	GSL Networks Pty LTD	✔	✔
	AS11232	Midcontinent Communications	✔	✔
	AS7843	Charter Communications Inc	✔	✔
	AS6327	Shaw Communications	✔	✔
	AS7922	Comcast Cable Communications, LLC	✔	✔
	AS49544	i3D.net B.V	✔	✔
	AS20473	The Constant Company, LLC	✔	✔
	AS13335	Cloudflare, Inc.	✔	✔
	AS1828	Unitas Global	✘	✔
	AS32709	Joink, LLC	✔	✘
	AS53597	Hoyos Consulting LLC	✔	✔
	AS32590	Valve Corporation	✔	✔
	AS4826	Vocus Connect International Backbone	✔	✘
	AS8220	COLT	✔	✔
	AS11164	Internet2 I2PX	✔	✔
	AS62887	WhiteSky Communications, LLC.	✔	✘
	AS12129	123.Net, Inc.	✔	✘
	AS14907	Wikimedia Foundation Inc.	✔	✔
	AS62642	Bigleaf Networks, Inc.	✔	✘
	AS36236	NetActuate, Inc	✔	✔
	AS6079	Astound (fka. RCN)	✔	✘
	AS24482	SG.GS	✔	✔
	AS293	ESnet	✔	✔

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Downstreams

	ASN	Description	IPv4	IPv6
	AS24406	China Internet Network Infomation Center	✔	✔
	AS3557	ISC - F-root	✔	✔

ASHandle:       AS33071
OrgID:          ISC-94
ASName:         ISC-F-AS
ASNumber:       33071
RegDate:        2004-09-28
Comment:        For details of F root nameserver operations, see http://f.root-servers.org/.
Updated:        2012-02-24
Source:         ARIN



OrgID:          ISC-94
OrgName:        Internet Systems Consortium, Inc.
CanAllocate:    
Street:         PO Box 360
City:           Newmarket
State/Prov:     NH
Country:        US
PostalCode:     03857
RegDate:        2004-01-09
Updated:        2024-01-03
OrgAdminHandle: ISCN-ARIN
OrgTechHandle:  BELLI82-ARIN
OrgTechHandle:  ISCN-ARIN
OrgTechHandle:  JSO127-ARIN
OrgTechHandle:  RA15-ARIN
OrgAbuseHandle: ISCAT-ARIN
OrgNOCHandle:   ISCN-ARIN
Source:         ARIN





OrgAdminHandle:       ISCN-ARIN
OrgAdminName:          Internet Systems Consortium NOC
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        BELLI82-ARIN
OrgTechName:          Ray Bellis
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        ISCN-ARIN
OrgTechName:           Internet Systems Consortium NOC
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        JSO127-ARIN
OrgTechName:          Jeffrey Osborn
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        RA15-ARIN
OrgTechName:          Rick Adams
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       ISCAT-ARIN
OrgAbuseName:          Internet Systems Consortium Abuse Team
# Email removed, Log into bgp.tools to see whois emails


OrgNOCHandle:         ISCN-ARIN
OrgNOCName:            Internet Systems Consortium NOC
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2026-03-13T03:27:50Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RIPE	as-gttcust	89456
RIPE	as-transroute-spec	19641
RADB	as-hurricane	24681
RADB	as33071:as-set	4
RADB	as-hurricanev6	20659
RADB	as-mzima-customers	63120