GS1 Application Identifiers

A GS1 Application Identifier (AI) is a short number, 2 to 4 digits, that says what the data after it means. (01) introduces a GTIN, (17) an expiry date, (10) a batch number. AIs let one barcode carry several pieces of data. They’re used in GS1-128, GS1 DataMatrix, GS1 QR Code, GS1 DataBar Expanded, and, written as part of a web address, in GS1 Digital Link.

Decode one

Scan or paste a barcode and see every part of it.

Make one

Generate a valid barcode from fields.

The most common AIs

AI	What it is	Format
`00`	SSCC: identifies one pallet or parcel	18 digits with a check digit
`01`	GTIN: identifies the product	14 digits with a check digit
`02`	GTIN of the products inside a logistics unit	14 digits with a check digit
`10`	Batch or lot number	Up to 20 characters
`11`	Production date	YYMMDD
`15`	Best before date	YYMMDD
`17`	Expiry date	YYMMDD
`21`	Serial number	Up to 20 characters
`30`	Count of items, when it varies	Up to 8 digits
`37`	Count of trade items in a logistics unit	Up to 8 digits
`3103`	Net weight in kilograms, 3 decimal places	6 digits
`392n`	Price to pay, n decimal places	Up to 15 digits

How to read an AI

Fixed and variable length

Some AIs always have the same length: (01) is always followed by 14 digits, (17) by 6. Others vary: (10) can be 1 to 20 characters. When a variable-length field is followed by another field, the barcode ends it with a separator: the special character FNC1, which scanners send as GS (ASCII 29). The last field never needs one. The “Separator after it” column below says which AIs need it.

Decimal places in the last digit

For measures, prices and amounts, the AI’s fourth digit says where the decimal point goes. 3100 to 3105 are all net weight in kilograms: (3103)001250 is 1.250 kg, and (3102)001250 is 12.50 kg.

Dates

Dates are 6 digits, YYMMDD, with no century. GS1 defines how to work out the century from the current date. Some date AIs allow the day to be 00, meaning the end of the month.

Data titles

The data title is GS1’s short name for each AI, such as BATCH/LOT or USE BY or EXPIRY. Some labels print it next to the human-readable value.

All AIs

Generated from the GS1 Barcode Syntax Dictionary, release 2026-01-27. 224 entries.

0: Identification keys

AI	Data title	Format	Separator after it
`00`	SSCC	18 digits with a check digit	Not needed
`01`	GTIN	14 digits with a check digit	Not needed
`02`	CONTENT	14 digits with a check digit	Not needed
`03`	MTO GTIN	14 digits with a check digit	Not needed

1: Batch and dates

AI	Data title	Format	Separator after it
`10`	BATCH/LOT	Up to 20 characters	If not last
`11`	PROD DATE	6 digits: a date, YYMMDD (the day can be 00)	Not needed
`12`	DUE DATE	6 digits: a date, YYMMDD (the day can be 00)	Not needed
`13`	PACK DATE	6 digits: a date, YYMMDD (the day can be 00)	Not needed
`15`	BEST BEFORE or BEST BY	6 digits: a date, YYMMDD (the day can be 00)	Not needed
`16`	SELL BY	6 digits: a date, YYMMDD (the day can be 00)	Not needed
`17`	USE BY or EXPIRY	6 digits: a date, YYMMDD (the day can be 00)	Not needed

2: Variants, serial numbers and other identifiers

AI	Data title	Format	Separator after it
`20`	VARIANT	2 digits	Not needed
`21`	SERIAL	Up to 20 characters	If not last
`22`	CPV	Up to 20 characters	If not last
`235`	TPX	Up to 28 characters	If not last
`240`	ADDITIONAL ID	Up to 30 characters	If not last
`241`	CUST. PART No.	Up to 30 characters	If not last
`242`	MTO VARIANT	Up to 6 digits	If not last
`243`	PCN	Up to 20 characters	If not last
`250`	SECONDARY SERIAL	Up to 30 characters	If not last
`251`	REF. TO SOURCE	Up to 30 characters	If not last
`253`	GDTI	13 digits with a check digit, then optionally up to 17 characters	If not last
`254`	GLN EXTENSION COMPONENT	Up to 20 characters	If not last
`255`	GCN	13 digits with a check digit, then optionally up to 12 digits	If not last

3: Measures, weights and counts

AI	Data title	Format	Separator after it
`30`	VAR. COUNT	Up to 8 digits	If not last
`3100–3105`	NET WEIGHT (kg)	6 digits	Not needed
`3110–3115`	LENGTH (m)	6 digits	Not needed
`3120–3125`	WIDTH (m)	6 digits	Not needed
`3130–3135`	HEIGHT (m)	6 digits	Not needed
`3140–3145`	AREA (m²)	6 digits	Not needed
`3150–3155`	NET VOLUME (l)	6 digits	Not needed
`3160–3165`	NET VOLUME (m³)	6 digits	Not needed
`3200–3205`	NET WEIGHT (lb)	6 digits	Not needed
`3210–3215`	LENGTH (in)	6 digits	Not needed
`3220–3225`	LENGTH (ft)	6 digits	Not needed
`3230–3235`	LENGTH (yd)	6 digits	Not needed
`3240–3245`	WIDTH (in)	6 digits	Not needed
`3250–3255`	WIDTH (ft)	6 digits	Not needed
`3260–3265`	WIDTH (yd)	6 digits	Not needed
`3270–3275`	HEIGHT (in)	6 digits	Not needed
`3280–3285`	HEIGHT (ft)	6 digits	Not needed
`3290–3295`	HEIGHT (yd)	6 digits	Not needed
`3300–3305`	GROSS WEIGHT (kg)	6 digits	Not needed
`3310–3315`	LENGTH (m), log	6 digits	Not needed
`3320–3325`	WIDTH (m), log	6 digits	Not needed
`3330–3335`	HEIGHT (m), log	6 digits	Not needed
`3340–3345`	AREA (m²), log	6 digits	Not needed
`3350–3355`	VOLUME (l), log	6 digits	Not needed
`3360–3365`	VOLUME (m³), log	6 digits	Not needed
`3370–3375`	KG PER m²	6 digits	Not needed
`3400–3405`	GROSS WEIGHT (lb)	6 digits	Not needed
`3410–3415`	LENGTH (in), log	6 digits	Not needed
`3420–3425`	LENGTH (ft), log	6 digits	Not needed
`3430–3435`	LENGTH (yd), log	6 digits	Not needed
`3440–3445`	WIDTH (in), log	6 digits	Not needed
`3450–3455`	WIDTH (ft), log	6 digits	Not needed
`3460–3465`	WIDTH (yd), log	6 digits	Not needed
`3470–3475`	HEIGHT (in), log	6 digits	Not needed
`3480–3485`	HEIGHT (ft), log	6 digits	Not needed
`3490–3495`	HEIGHT (yd), log	6 digits	Not needed
`3500–3505`	AREA (in²)	6 digits	Not needed
`3510–3515`	AREA (ft²)	6 digits	Not needed
`3520–3525`	AREA (yd²)	6 digits	Not needed
`3530–3535`	AREA (in²), log	6 digits	Not needed
`3540–3545`	AREA (ft²), log	6 digits	Not needed
`3550–3555`	AREA (yd²), log	6 digits	Not needed
`3560–3565`	NET WEIGHT (tr oz)	6 digits	Not needed
`3570–3575`	NET VOLUME (oz)	6 digits	Not needed
`3600–3605`	NET VOLUME (qt (US))	6 digits	Not needed
`3610–3615`	NET VOLUME (gal.)	6 digits	Not needed
`3620–3625`	VOLUME (qt (US)), log	6 digits	Not needed
`3630–3635`	VOLUME (gal (US)), log	6 digits	Not needed
`3640–3645`	NET VOLUME (in³)	6 digits	Not needed
`3650–3655`	NET VOLUME (ft³)	6 digits	Not needed
`3660–3665`	NET VOLUME (yd³)	6 digits	Not needed
`3670–3675`	VOLUME (in³), log	6 digits	Not needed
`3680–3685`	VOLUME (ft³), log	6 digits	Not needed
`3690–3695`	VOLUME (yd³), log	6 digits	Not needed
`37`	COUNT	Up to 8 digits	If not last
`3900–3909`	AMOUNT	Up to 15 digits	If not last
`3910–3919`	AMOUNT	3 digits: an ISO 4217 numeric currency code, then up to 15 digits	If not last
`3920–3929`	PRICE	Up to 15 digits	If not last
`3930–3939`	PRICE	3 digits: an ISO 4217 numeric currency code, then up to 15 digits	If not last
`3940–3943`	PRCNT OFF	4 digits	If not last
`3950–3955`	PRICE/UoM	6 digits	If not last

4: Locations, routing and shipping

AI	Data title	Format	Separator after it
`400`	ORDER NUMBER	Up to 30 characters	If not last
`401`	GINC	Up to 30 characters	If not last
`402`	GSIN	17 digits with a check digit	If not last
`403`	ROUTE	Up to 30 characters	If not last
`410`	SHIP TO LOC	13 digits with a check digit	Not needed
`411`	BILL TO	13 digits with a check digit	Not needed
`412`	PURCHASE FROM	13 digits with a check digit	Not needed
`413`	SHIP FOR LOC	13 digits with a check digit	Not needed
`414`	LOC No.	13 digits with a check digit	Not needed
`415`	PAY TO	13 digits with a check digit	Not needed
`416`	PROD/SERV LOC	13 digits with a check digit	Not needed
`417`	PARTY	13 digits with a check digit	Not needed
`420`	SHIP TO POST	Up to 20 characters	If not last
`421`	SHIP TO POST	3 digits: an ISO 3166 numeric country code, then up to 9 characters	If not last
`422`	ORIGIN	3 digits: an ISO 3166 numeric country code	If not last
`423`	COUNTRY - INITIAL PROCESS	3 digits: an ISO 3166 numeric country code, then optionally the same up to 4 more times	If not last
`424`	COUNTRY - PROCESS	3 digits: an ISO 3166 numeric country code	If not last
`425`	COUNTRY - DISASSEMBLY	3 digits: an ISO 3166 numeric country code, then optionally the same up to 4 more times	If not last
`426`	COUNTRY - FULL PROCESS	3 digits: an ISO 3166 numeric country code	If not last
`427`	ORIGIN SUBDIVISION	Up to 3 characters	If not last
`4300`	SHIP TO COMP	Up to 35 characters	If not last
`4301`	SHIP TO NAME	Up to 35 characters	If not last
`4302`	SHIP TO ADD1	Up to 70 characters	If not last
`4303`	SHIP TO ADD2	Up to 70 characters	If not last
`4304`	SHIP TO SUB	Up to 70 characters	If not last
`4305`	SHIP TO LOC	Up to 70 characters	If not last
`4306`	SHIP TO REG	Up to 70 characters	If not last
`4307`	SHIP TO COUNTRY	2 characters: an ISO 3166 two-letter country code	If not last
`4308`	SHIP TO PHONE	Up to 30 characters	If not last
`4309`	SHIP TO GEO	10 digits: a latitude, then 10 digits: a longitude	If not last
`4310`	RTN TO COMP	Up to 35 characters	If not last
`4311`	RTN TO NAME	Up to 35 characters	If not last
`4312`	RTN TO ADD1	Up to 70 characters	If not last
`4313`	RTN TO ADD2	Up to 70 characters	If not last
`4314`	RTN TO SUB	Up to 70 characters	If not last
`4315`	RTN TO LOC	Up to 70 characters	If not last
`4316`	RTN TO REG	Up to 70 characters	If not last
`4317`	RTN TO COUNTRY	2 characters: an ISO 3166 two-letter country code	If not last
`4318`	RTN TO POST	Up to 20 characters	If not last
`4319`	RTN TO PHONE	Up to 30 characters	If not last
`4320`	SRV DESCRIPTION	Up to 35 characters	If not last
`4321`	DANGEROUS GOODS	1 digit: 0 or 1	If not last
`4322`	AUTH TO LEAVE	1 digit: 0 or 1	If not last
`4323`	SIG REQUIRED	1 digit: 0 or 1	If not last
`4324`	NOT BEF DEL DT	6 digits: a date, YYMMDD (the day can be 00), then 4 digits: a time, HHMM	If not last
`4325`	NOT AFT DEL DT	6 digits: a date, YYMMDD (the day can be 00), then 4 digits: a time, HHMM	If not last
`4326`	REL DATE	6 digits: a date, YYMMDD	If not last
`4330`	MAX TEMP F.	6 digits, then optionally 1 character	If not last
`4331`	MAX TEMP C.	6 digits, then optionally 1 character	If not last
`4332`	MIN TEMP F.	6 digits, then optionally 1 character	If not last
`4333`	MIN TEMP C.	6 digits, then optionally 1 character	If not last

7: Additional product and regulatory data

AI	Data title	Format	Separator after it
`7001`	NSN	13 digits	If not last
`7002`	MEAT CUT	Up to 30 characters	If not last
`7003`	EXPIRY TIME	6 digits: a date, YYMMDD, then 4 digits: a time, HHMM	If not last
`7004`	ACTIVE POTENCY	Up to 4 digits	If not last
`7005`	CATCH AREA	Up to 12 characters	If not last
`7006`	FIRST FREEZE DATE	6 digits: a date, YYMMDD	If not last
`7007`	HARVEST DATE	6 digits: a date, YYMMDD, then optionally the same up to 1 more time	If not last
`7008`	AQUATIC SPECIES	Up to 3 characters	If not last
`7009`	FISHING GEAR TYPE	Up to 10 characters	If not last
`7010`	PROD METHOD	Up to 2 characters	If not last
`7011`	TEST BY DATE	6 digits: a date, YYMMDD, then optionally 4 digits: a time, HHMM	If not last
`7020`	REFURB LOT	Up to 20 characters	If not last
`7021`	FUNC STAT	Up to 20 characters	If not last
`7022`	REV STAT	Up to 20 characters	If not last
`7023`	GIAI - ASSEMBLY	Up to 30 characters	If not last
`7030`	PROCESSOR # 0	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7031`	PROCESSOR # 1	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7032`	PROCESSOR # 2	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7033`	PROCESSOR # 3	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7034`	PROCESSOR # 4	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7035`	PROCESSOR # 5	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7036`	PROCESSOR # 6	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7037`	PROCESSOR # 7	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7038`	PROCESSOR # 8	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7039`	PROCESSOR # 9	3 digits: an ISO 3166 numeric country code, or 999, then up to 27 characters	If not last
`7040`	UIC+EXT	1 digit, then 1 character, then 1 character, then 1 character	If not last
`7041`	UFRGT UNIT TYPE	Up to 4 characters: a package type code	If not last
`710`	NHRN PZN	Up to 20 characters	If not last
`711`	NHRN CIP	Up to 20 characters	If not last
`712`	NHRN CN	Up to 20 characters	If not last
`713`	NHRN DRN	Up to 20 characters	If not last
`714`	NHRN AIM	Up to 20 characters	If not last
`715`	NHRN NDC	Up to 20 characters	If not last
`716`	NHRN AIC	Up to 20 characters	If not last
`717`	NHRN SRN	Up to 20 characters	If not last
`7230`	CERT # 1	2 characters, then up to 28 characters	If not last
`7231`	CERT # 2	2 characters, then up to 28 characters	If not last
`7232`	CERT # 3	2 characters, then up to 28 characters	If not last
`7233`	CERT # 4	2 characters, then up to 28 characters	If not last
`7234`	CERT # 5	2 characters, then up to 28 characters	If not last
`7235`	CERT # 6	2 characters, then up to 28 characters	If not last
`7236`	CERT # 7	2 characters, then up to 28 characters	If not last
`7237`	CERT # 8	2 characters, then up to 28 characters	If not last
`7238`	CERT # 9	2 characters, then up to 28 characters	If not last
`7239`	CERT # 10	2 characters, then up to 28 characters	If not last
`7240`	PROTOCOL	Up to 20 characters	If not last
`7241`	AIDC MEDIA TYPE	2 digits: a media type code	If not last
`7242`	VCN	Up to 25 characters	If not last
`7250`	DOB	8 digits: a date, YYYYMMDD	If not last
`7251`	DOB TIME	8 digits: a date, YYYYMMDD, then 4 digits: a time, HHMM	If not last
`7252`	BIO SEX	1 digit: an ISO 5218 sex code	If not last
`7253`	FAMILY NAME	Up to 40 characters	If not last
`7254`	GIVEN NAME	Up to 40 characters	If not last
`7255`	SUFFIX	Up to 10 characters	If not last
`7256`	FULL NAME	Up to 90 characters	If not last
`7257`	PERSON ADDR	Up to 70 characters	If not last
`7258`	BIRTH SEQUENCE	3 characters	If not last
`7259`	BABY	Up to 40 characters	If not last

8: Additional identifiers, coupons and services

AI	Data title	Format	Separator after it
`8001`	DIMENSIONS	4 digits: not 0, then 5 digits: not 0, then 3 digits: not 0, then 1 digit: the winding direction, 0, 1 or 9, then 1 digit	If not last
`8002`	CMT No.	Up to 20 characters	If not last
`8003`	GRAI	1 digit: always 0, then 13 digits with a check digit, then optionally up to 16 characters	If not last
`8004`	GIAI	Up to 30 characters	If not last
`8005`	PRICE PER UNIT	6 digits	If not last
`8006`	ITIP	14 digits with a check digit, then 4 digits: piece number and total	If not last
`8007`	IBAN	Up to 34 characters: an IBAN	If not last
`8008`	PROD TIME	6 digits: a date, YYMMDD, then 2 digits: an hour, HH, then optionally 2 digits: minutes, MM, then optionally 2 digits: seconds, SS	If not last
`8009`	OPTSEN	Up to 50 characters	If not last
`8010`	CPID	Up to 30 characters (A–Z, 0–9, #, -, /)	If not last
`8011`	CPID SERIAL	Up to 12 digits	If not last
`8012`	VERSION	Up to 20 characters	If not last
`8013`	GMN	Up to 25 characters with check characters	If not last
`8014`	MUDI	Up to 25 characters with check characters	If not last
`8017`	GSRN - PROVIDER	18 digits with a check digit	If not last
`8018`	GSRN - RECIPIENT	18 digits with a check digit	If not last
`8019`	SRIN	Up to 10 digits	If not last
`8020`	REF No.	Up to 25 characters	If not last
`8026`	ITIP CONTENT	14 digits with a check digit, then 4 digits: piece number and total	If not last
`8030`	DIGSIG	Up to 90 base64url character	If not last
`8040`	IMEI	15 digits	If not last
`8041`	IMEI2	15 digits	If not last
`8042`	ESIM	32 digits	If not last
`8043`	PSIM	18 digits, then optionally up to 2 digits	If not last
`8110`		Up to 70 characters	If not last
`8111`	POINTS	4 digits	If not last
`8112`		Up to 70 characters	If not last
`8200`	PRODUCT URL	Up to 70 characters	If not last

9: Company internal and mutually agreed

AI	Data title	Format	Separator after it
`90`	INTERNAL	Up to 30 characters	If not last
`91–99`	INTERNAL	Up to 90 characters	If not last

Reading AIs in your app

Don’t split GS1 data by position or by searching for AI digits: the same digits can appear inside a value. Use a parser that knows each AI’s length. ZipZapKit includes one: see GS1 Application Identifiers.

Specification

GS1 Barcode Syntax Dictionary, release 2026-01-27: the source of the full table on this page, maintained by GS1.
GS1 General Specifications, section 3: the definitive list of AIs and their rules.

Reference

Retail (GTIN)

Logistics and industrial

2D

Postal

Documents

Decode one

Make one

The most common AIs

How to read an AI

Fixed and variable length

Decimal places in the last digit

Dates

Data titles

All AIs

0: Identification keys

1: Batch and dates

2: Variants, serial numbers and other identifiers

3: Measures, weights and counts

4: Locations, routing and shipping

7: Additional product and regulatory data

8: Additional identifiers, coupons and services

9: Company internal and mutually agreed

Reading AIs in your app

Specification

Decode one

Make one

​The most common AIs

​How to read an AI

​Fixed and variable length

​Decimal places in the last digit

​Dates

​Data titles

​All AIs

​0: Identification keys

​1: Batch and dates

​2: Variants, serial numbers and other identifiers

​3: Measures, weights and counts

​4: Locations, routing and shipping

​7: Additional product and regulatory data

​8: Additional identifiers, coupons and services

​9: Company internal and mutually agreed

​Reading AIs in your app

​Specification

The most common AIs

How to read an AI

Fixed and variable length

Decimal places in the last digit

Dates

Data titles

All AIs

0: Identification keys

1: Batch and dates

2: Variants, serial numbers and other identifiers

3: Measures, weights and counts

4: Locations, routing and shipping

7: Additional product and regulatory data

8: Additional identifiers, coupons and services

9: Company internal and mutually agreed

Reading AIs in your app

Specification