EncodedLegIssuerLen (FIX tag 618)

LengthFIX 4.4

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

At a glance

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

What the specification says

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

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

Other Length fields

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