EncodedLegIssuerLen (FIX tag 618)

LengthFIX 4.4FIX 5.0 SP2

EncodedLegIssuerLen (tag 618) is a Length field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 50 message types, always optionally.

At a glance

Tag: 618
Name: EncodedLegIssuerLen
Datatype: Length (int)
Dialects: FIX 4.4 and FIX 5.0 SP2
Messages: 50

What the specification says

FIX 4.4

Multileg instrument's individual security’s EncodedIssuerLen. See EncodedIssuerLen (348) field for description

FIX 5.0 SP2

Multileg instrument's individual security's EncodedIssuerLen.

Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.

A real message using tag 618

ExecutionReport · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	175
35	MsgType	8	Execution Report
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
37	OrderID	ORD-10042
17	ExecID	EXEC-88117
150	ExecType	0	New
39	OrdStatus	0	New
54	Side	1	Buy
151	LeavesQty	0
14	CumQty	1000000
6	AvgPx	1.09215
555	NoLegs2 entries	2	repeating group
600	LegSymbol	EXAMPLE
618	EncodedLegIssuerLen	7
600	LegSymbol	EXAMPLE
618	EncodedLegIssuerLen	7
10	CheckSum	022

Edit and decode it yourself

Shown with | separators for readability. On the wire FIX uses SOH (0x01), an invisible control byte — and because BodyLength and CheckSum are computed over the actual bytes, the two forms have different checksums. Both are valid and both decode here.

Open in the full decoder →

Generated from the FIX 4.4 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.

Where tag 618 appears

Requiredness is a property of the message, not of the field: the same tag can be optional in one message and conditionally required in another.

Message	MsgType	FIX 4.4	FIX 5.0 SP2	Where in the message
Advertisement	7	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
AllocationInstruction	J	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
AllocationInstructionAlert	BM	—	Optional	inside InstrmtLegGrp › InstrumentLeg
AllocationReport	AS	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
AssignmentReport	AW	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CollateralAssignment	AY	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CollateralInquiry	BB	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CollateralInquiryAck	BG	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CollateralReport	BA	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CollateralRequest	AX	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CollateralResponse	AZ	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
Confirmation	AK	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CrossOrderCancelReplaceRequest	t	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
CrossOrderCancelRequest	u	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
DerivativeSecurityList	AA	Conditional	Optional	inside RelSymDerivSecGrp › InstrmtLegGrp › InstrumentLeg
DerivativeSecurityListUpdateReport	BR	—	Optional	inside RelSymDerivSecUpdGrp › InstrmtLegGrp › InstrumentLeg
DontKnowTrade	Q	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
Email	C	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
ExecutionAcknowledgement	BN	—	Optional	inside InstrmtLegGrp › InstrumentLeg
ExecutionReport	8	Conditional	Optional	inside InstrmtLegExecGrp › InstrumentLeg
IOI	6	Conditional	Optional	inside InstrmtLegIOIGrp › InstrumentLeg
MarketDataIncrementalRefresh	X	Conditional	Optional	inside MDIncGrp › InstrmtLegGrp › InstrumentLeg
MarketDataRequest	V	Conditional	Optional	inside InstrmtMDReqGrp › InstrmtLegGrp › InstrumentLeg
MarketDataSnapshotFullRefresh	W	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
MassQuote	i	Conditional	Optional	inside QuotSetGrp › QuotEntryGrp › InstrmtLegGrp › InstrumentLeg
MassQuoteAcknowledgement	b	Conditional	Optional	inside QuotSetAckGrp › QuotEntryAckGrp › InstrmtLegGrp › InstrumentLeg
MultilegOrderCancelReplace	AC	Conditional	Optional	inside LegOrdGrp › InstrumentLeg
NewOrderCross	s	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
NewOrderMultileg	AB	Conditional	Optional	inside LegOrdGrp › InstrumentLeg
News	B	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
PositionMaintenanceReport	AM	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
PositionMaintenanceRequest	AL	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
PositionReport	AP	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
Quote	S	Conditional	Optional	inside LegQuotGrp › InstrumentLeg
QuoteCancel	Z	Conditional	Optional	inside QuotCxlEntriesGrp › InstrmtLegGrp › InstrumentLeg
QuoteRequest	R	Conditional	Optional	inside QuotReqGrp › QuotReqLegsGrp › InstrumentLeg
QuoteRequestReject	AG	Conditional	Optional	inside QuotReqRjctGrp › QuotReqLegsGrp › InstrumentLeg
QuoteResponse	AJ	Conditional	Optional	inside LegQuotGrp › InstrumentLeg
QuoteStatusReport	AI	Conditional	Optional	inside LegQuotStatGrp › InstrumentLeg
QuoteStatusRequest	a	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
RFQRequest	AH	Conditional	Optional	inside RFQReqGrp › InstrmtLegGrp › InstrumentLeg
RequestForPositions	AN	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
RequestForPositionsAck	AO	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
SecurityDefinition	d	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
SecurityDefinitionRequest	c	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
SecurityDefinitionUpdateReport	BP	—	Optional	inside InstrmtLegGrp › InstrumentLeg
SecurityList	y	Conditional	Optional	inside SecListGrp › InstrmtLegSecListGrp › InstrumentLeg
SecurityListRequest	x	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
SecurityListUpdateReport	BK	—	Optional	inside SecLstUpdRelSymGrp › SecLstUpdRelSymsLegGrp › InstrumentLeg
SecurityStatus	f	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
SecurityStatusRequest	e	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
TradeCaptureReport	AE	Conditional	Optional	inside TrdInstrmtLegGrp › InstrumentLeg
TradeCaptureReportAck	AR	Conditional	Optional	inside TrdInstrmtLegGrp › InstrumentLeg
TradeCaptureReportRequest	AD	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg
TradeCaptureReportRequestAck	AQ	Conditional	Optional	inside InstrmtLegGrp › InstrumentLeg

Wire format

A byte count for the length-prefixed field that follows it. Count bytes, not characters — a multi-byte UTF-8 value makes the two differ. @boarteam/fix parses the value as a number and reports parse/invalid-int when it does not lex as one; the raw string is kept either way.

Read tag 618 in TypeScript

decode.tsts

import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix44";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const field = message.fields[618];field?.name;   // "EncodedLegIssuerLen"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a number

Decode this in your own code

The same engine that produced the decoded example above is an Apache-2.0 npm package with zero runtime dependencies. It runs in Node and in the browser, and parse() returns problems as data instead of throwing.

npm i @boarteam/fix @boarteam/fix-dict-fix44

Try the decoder Source on GitHub