StandardHeader

The standard FIX message header

Tag	Name	Type	Description
8	BeginString	String	FIX.4.2 (Always unencrypted, must be first field in message)
9	BodyLength	Int	Always unencrypted, must be second field in message
35	MsgType	String Enum	Always unencrypted, must be third field in message
49	SenderCompID	String	Always unencrypted
56	TargetCompID	String	Always unencrypted
115	OnBehalfOfCompID	String	Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
128	DeliverToCompID	String	Trading partner company ID used when sending messages via a third party (Can be embedded within encrypted data section.)
90	SecureDataLen	Int	Required to identify length of encrypted section of message. (Always unencrypted)
91	SecureData	Data	Required when message body is encrypted. Always immediately follows SecureDataLen field
34	MsgSeqNum	Int	Can be embedded within encrypted data section
50	SenderSubID	String	Can be embedded within encrypted data section
142	SenderLocationID	String	Sender's LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
57	TargetSubID	String	"ADMIN" reserved for administrative messages not intended for a specific user. (Can be embedded within encrypted data section.)
143	TargetLocationID	String	Trading partner LocationID (i.e. geographic location and/or desk) (Can be embedded within encrypted data section.)
116	OnBehalfOfSubID	String	Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
144	OnBehalfOfLocationID	String	Trading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)
129	DeliverToSubID	String	Trading partner SubID used when delivering messages via a third party. (Can be embedded within encrypted data section.)
145	DeliverToLocationID	String	Trading partner LocationID (i.e. geographic location and/or desk) used when delivering messages via a third party. (Can be embedded within encrypted data section.)
43	PossDupFlag	Boolean Enum	Always required for retransmitted messages, whether prompted by the sending system or as the result of a resend request. (Can be embedded within encrypted data section.)
97	PossResend	Boolean Enum	Required when message may be duplicate of another message sent under a different sequence number. (Can be embedded within encrypted data section.)
52	SendingTime	UTCTimestamp	Can be embedded within encrypted data section
122	OrigSendingTime	UTCTimestamp	Required for message resent as a result of a ResendRequest. If data is not available set to same value as SendingTime (Can be embedded within encrypted data section.)
212	XmlDataLen	Int	Required when specifying XmlData to identify the length of a XmlData message block. (Can be embedded within encrypted data section.)
213	XmlData	Data	Can contain an XML-formatted message block (e.g. FIXML). Always immediately follows XmlDataLen field. (Can be embedded within encrypted data section.) See Appendix M – FIXML Support
347	MessageEncoding	String Enum	Type of message encoding (non-ASCII characters) used in a message’s "Encoded" fields. Required if any "Encoding" fields are used
369	LastMsgSeqNumProcessed	Int	The last MsgSeqNum value received and processed. Can be specified on every message sent. Useful for detecting a backlog with a counterparty
370	OnBehalfOfSendingTime	UTCTimestamp	Used when a message is sent via a "hub" or "service bureau". If A sends to Q (the hub) who then sends to B via a separate FIX session, then when Q sends to B the value of this field should represent the SendingTime on the message A sent to Q. (always expressed in UTC (Universal Time Coordinated, also known as "GMT")