AS6404 FactSet Research Systems, Inc.

FACTSET - FactSet Research Systems, Inc. · registered in the United States

IPv4 addresses2,8167 prefixes · <0.001% of announced IPv4

Rank in United States#5,460largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#19,334of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS6404 in ASN lookup Look up an IP in this network (64.209.89.1) All networks in United States

IPv4 prefixes

All 7 prefixes, in address order.

64.209.89.0/24
164.55.242.0/24
164.55.245.0/24
164.55.246.0/24
164.55.248.0/22
164.55.252.0/23
164.55.254.0/24

Other ASNs named FactSet Research Systems, Inc.

2 other networks use the same organisation name; together with AS6404 they announce 3,840 IPv4 addresses.

ASNNameIPv4 addresses

AS32957AVSL-AS32957 - FactSet Research Systems, Inc. US768

AS30494FACTSET - FactSet Research Systems, Inc. US256

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AS6482#5461 THRYV - Thryv2,816

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AS9087#5463 RACKDOG-EU Rackdog, LLC2,816

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources