AS40841 MARKETAXESS HOLDINGS, INC.

• IPv4 Prefixes

Country	Announced Prefix	Description	Valid ROA	Parent Prefix	RIR
	38.108.243.0/24	PSINet, Inc.		38.0.0.0/8	ARIN
	64.215.249.0/24	Level 3 Parent, LLC		64.212.0.0/14	ARIN
	192.69.225.0/24	MARKETAXESS HOLDINGS, INC.		192.69.224.0/22	ARIN
	192.69.226.0/24	MARKETAXESS HOLDINGS, INC.		193.39.168.0/22	RIPE
	194.69.74.0/23	MARKETAXESS POST-TRADE LIMITED		194.69.64.0/19	RIPE
	194.69.74.0/24	MARKETAXESS POST-TRADE LIMITED		194.69.64.0/19	RIPE
	194.69.75.0/24	MARKETAXESS POST-TRADE LIMITED		194.69.64.0/19	RIPE
	194.69.80.0/23	MARKETAXESS POST-TRADE LIMITED		194.69.64.0/19	RIPE
	194.69.80.0/24	TRAX Production Internet 194.69.80.0/24		194.69.64.0/19	RIPE
	194.69.82.0/24	Trax TEST Internet 194.69.82.0/24		194.69.64.0/19	RIPE
	204.128.52.0/24	MARKETAXESS HOLDINGS, INC.		204.128.52.0/22	ARIN
	204.128.52.0/22	MARKETAXESS HOLDINGS, INC.		204.128.52.0/22	ARIN
	204.128.53.0/24	MARKETAXESS HOLDINGS, INC.		204.128.52.0/22	ARIN
	204.128.54.0/24	MARKETAXESS HOLDINGS, INC.		204.128.52.0/22	ARIN
	204.128.55.0/24	MARKETAXESS HOLDINGS, INC.		204.128.52.0/22	ARIN

• IPv4 Peers

Country	ASN	Name	Description
	AS174	COGENT-174	Cogent Communications
	AS3257	GTT-BACKBONE	GTT
	AS46887	CROWNCASTLE-AS46887	Crown Castle Fiber LLC
	AS3356	LEVEL3	Level 3 Parent, LLC
	AS6461	ZAYO-6461	Zayo Bandwidth
	AS40481	G3-ASN-1	G3 Group
	AS8220	COLT	COLT Technology Services Group Limited

• IPv4 Upstreams

Country	ASN	Name	Description
	AS174	COGENT-174	Cogent Communications
	AS6461	ZAYO-6461	Zayo Bandwidth
	AS8220	COLT	COLT Technology Services Group Limited
	AS3356	LEVEL3	Level 3 Parent, LLC
	AS46887	CROWNCASTLE-AS46887	Crown Castle Fiber LLC
	AS3257	GTT-BACKBONE	GTT

IPv4 Upstream Graph

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IPv4 Upstream Graph

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• IPv4 Downstreams

Country	ASN	Name	Description
	AS40481	G3-ASN-1	G3 Group

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2025, American Registry for Internet Numbers, Ltd.
#


ASNumber:       40841
ASName:         MARKETAXESS-INC-AS
ASHandle:       AS40841
RegDate:        2008-04-29
Updated:        2022-09-06
Comment:        Coontact MarketAxess Holdings Inc. at (212) 813-6111 or network@marketaxess.com for any questions or comments.    
Ref:            https://rdap.arin.net/registry/autnum/40841


OrgName:        MARKETAXESS HOLDINGS, INC.
OrgId:          MARKE-84
Address:        299 Park Avenue, 10th Floor
City:           NEW YORK
StateProv:      NY
PostalCode:     10171
Country:        US
RegDate:        2008-04-15
Updated:        2022-09-06
Ref:            https://rdap.arin.net/registry/entity/MARKE-84


OrgTechHandle: NEMH-ARIN
OrgTechName:   Network Engineering - MarketAxess Holdings inc
OrgTechPhone:  +1-212-813-6000 
OrgTechEmail:  NETWORK@marketaxess.com
OrgTechRef:    https://rdap.arin.net/registry/entity/NEMH-ARIN

OrgAbuseHandle: NEMH-ARIN
OrgAbuseName:   Network Engineering - MarketAxess Holdings inc
OrgAbusePhone:  +1-212-813-6000 
OrgAbuseEmail:  NETWORK@marketaxess.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NEMH-ARIN

OrgNOCHandle: NEMH-ARIN
OrgNOCName:   Network Engineering - MarketAxess Holdings inc
OrgNOCPhone:  +1-212-813-6000 
OrgNOCEmail:  NETWORK@marketaxess.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/NEMH-ARIN

RAbuseHandle: NEMH-ARIN
RAbuseName:   Network Engineering - MarketAxess Holdings inc
RAbusePhone:  +1-212-813-6000 
RAbuseEmail:  NETWORK@marketaxess.com
RAbuseRef:    https://rdap.arin.net/registry/entity/NEMH-ARIN

RNOCHandle: NEMH-ARIN
RNOCName:   Network Engineering - MarketAxess Holdings inc
RNOCPhone:  +1-212-813-6000 
RNOCEmail:  NETWORK@marketaxess.com
RNOCRef:    https://rdap.arin.net/registry/entity/NEMH-ARIN

RTechHandle: NEMH-ARIN
RTechName:   Network Engineering - MarketAxess Holdings inc
RTechPhone:  +1-212-813-6000 
RTechEmail:  NETWORK@marketaxess.com
RTechRef:    https://rdap.arin.net/registry/entity/NEMH-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2025, American Registry for Internet Numbers, Ltd.
#