3DS ReferenceProtocol & field guide

EMV 3-D Secure · Core specification 2.3.1.1

Browser IP AddressbrowserIP

IP address of the Browser as returned by the HTTP headers to the 3DS Requestor.

Read in message: AReq

Explore this field with transaction context

Message inclusion

Baseline inclusion. Effective requirements depend on transaction context. Check the field’s conditions and FAQ qualifications; select channel and category in the explorer.

MessageBaseline inclusion
AReqConditional

Conditional inclusion — source text

Required unless market or regional mandate restricts sending this information.

Format and scope

Type: String · Length: Variable, maximum 45 · Maximum length: 45

Source components
3DS Server
Device channels
02-BRW
Message categories
01-PA, 02-NPA

Reference notes

  • IPv4 representation per RFC 791, IPv6 representation per RFC 4291 Section 2.2. Should be the public IP address of the Browser connecting to the 3DS Requestor—key for ACS risk analysis. — FAQ 25 (EMVCo FAQ)

Version history

No field introduction version is tagged in the dataset. Introduction tags are curated metadata, not a full history of changes. Compare versions and understand coverage.

Source and review status

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf, Table A.1, PDF pages 211

Source review status: carried-forward. Carried-forward material has not acquired a new verification claim.

Source document fingerprint

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf

6fdf0aba3fc1a765f96b74dad4069d1e189969f38f0023647021687daf589d6b

Official EMVCo specifications · Methodology and coverage limits