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	Prefix	Description
	38.108.243.0/24	Cogent Communications, LLC
	64.215.249.0/24	MARKETAXESS HOLDINGS, INC.
	192.69.225.0/24	MARKETAXESS HOLDINGS, INC.
	192.69.226.0/24	MARKETAXESS HOLDINGS, INC.
	194.69.74.0/24	MARKETAXESS POST-TRADE LIMITED
	194.69.74.0/23	MARKETAXESS POST-TRADE LIMITED
	194.69.75.0/24	MARKETAXESS POST-TRADE LIMITED
	194.69.80.0/23	MARKETAXESS POST-TRADE LIMITED
	194.69.80.0/24	TRAX Production Internet 194.69.80.0/24
	194.69.82.0/24	Trax TEST Internet 194.69.82.0/24
	204.128.52.0/22	MARKETAXESS HOLDINGS, INC.
	204.128.52.0/24	MARKETAXESS HOLDINGS, INC.
	204.128.53.0/24	MARKETAXESS HOLDINGS, INC.
	204.128.54.0/24	MARKETAXESS HOLDINGS, INC.
	204.128.55.0/24	MARKETAXESS HOLDINGS, INC.

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS174	Cogent Communications, LLC	✔	✘
	AS6939	Hurricane Electric LLC	✔	✘
	AS3356	Lumen (Level 3)	✔	✘
	AS6461	Zayo Bandwidth	✔	✘
	AS8220	COLT	✔	✘
	AS3257	GTT Communications Inc.	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS6939	Hurricane Electric LLC	✔	✘
	AS174	Cogent Communications, LLC	✔	✘
	AS6461	Zayo Bandwidth	✔	✘
	AS8220	COLT	✔	✘
	AS3356	Lumen (Level 3)	✔	✘
	AS40481	G3 Group	✔	✘
	AS3257	GTT Communications Inc.	✔	✘
	AS1239	Sprint Wireline (Cogent)	✔	✘

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Downstreams

	ASN	Description	IPv4	IPv6
	AS40481	G3 Group	✔	✘

ASHandle:       AS40841
OrgID:          MARKE-84
ASName:         MARKETAXESS-INC-AS
ASNumber:       40841
RegDate:        2008-04-29
Comment:        Coontact MarketAxess Holdings Inc. at (212) 813-6111 or network@marketaxess.com for any questions or comments.
Updated:        2022-09-06
TechHandle:     NEMH-ARIN
AbuseHandle:    NEMH-ARIN
NOCHandle:      NEMH-ARIN
Source:         ARIN



OrgID:          MARKE-84
OrgName:        MARKETAXESS HOLDINGS, INC.
CanAllocate:    
Street:         299 Park Avenue, 10th Floor
City:           NEW YORK
State/Prov:     NY
Country:        US
PostalCode:     10171
RegDate:        2008-04-15
Updated:        2022-09-06
OrgAdminHandle: NEMH-ARIN
OrgTechHandle:  NEMH-ARIN
OrgAbuseHandle: NEMH-ARIN
OrgNOCHandle:   NEMH-ARIN
Source:         ARIN





OrgAdminHandle:       NEMH-ARIN
OrgAdminName:          Network Engineering - MarketAxess Holdings inc
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        NEMH-ARIN
OrgTechName:           Network Engineering - MarketAxess Holdings inc
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       NEMH-ARIN
OrgAbuseName:          Network Engineering - MarketAxess Holdings inc
# Email removed, Log into bgp.tools to see whois emails


OrgNOCHandle:         NEMH-ARIN
OrgNOCName:            Network Engineering - MarketAxess Holdings inc
# Email removed, Log into bgp.tools to see whois emails


TechHandle:           NEMH-ARIN
TechName:              Network Engineering - MarketAxess Holdings inc
# Email removed, Log into bgp.tools to see whois emails


AbuseHandle:          NEMH-ARIN
AbuseName:             Network Engineering - MarketAxess Holdings inc
# Email removed, Log into bgp.tools to see whois emails


NOCHandle:            NEMH-ARIN
NOCName:               Network Engineering - MarketAxess Holdings inc
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2026-06-14T03:26:45Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
RIPE	as-gttcust	91771
RIPE	as8220:as-coltuk	753
RIPE	as-transroute-spec	19618
RADB	as-udos	1227
ALTDB	as-jarmtelco	651
RADB	as-ctbc-customers74	50
RIPE	as-gttcust6	91201
RADB	as16657:as-cust	487
RADB	as-ccf-test	1461
ARIN	as-xo-b	59968
RADB	as-hurricane	25050
RADB	as-ccf	1539
LEVEL3	as-lumen-customers-asns	10695