When creating AWS CloudFormation templates that have EC2 instance type parameters, it can be tedious to create the allowed values list to validate the instance type string.

Here are some sets of instance types that can be copy-pasted into the "AllowedValues" field of your AWS CloudFormation EC2 instance type parameter.

View more info on these instance types: Amazon EC2 Instance Types

My Most Commonly Used Set

[
  "t3.2xlarge", "t3.large", "t3.medium", "t3.micro", "t3.nano", "t3.small", "t3.xlarge",
  "m5.12xlarge", "m5.16xlarge", "m5.24xlarge", "m5.2xlarge", "m5.4xlarge", "m5.8xlarge", "m5.large", "m5.xlarge"
]

All Instance Types

[
  "a1.2xlarge", "a1.4xlarge", "a1.large", "a1.medium", "a1.metal", "a1.xlarge",
  "c1.medium", "c1.xlarge", "c3.2xlarge", "c3.4xlarge", "c3.8xlarge", "c3.large", "c3.xlarge", "c4.2xlarge", "c4.4xlarge", "c4.8xlarge", "c4.large", "c4.xlarge", "c5.12xlarge", "c5.18xlarge", "c5.24xlarge", "c5.2xlarge", "c5.4xlarge", "c5.9xlarge", "c5.large", "c5.metal", "c5.xlarge", "c5d.12xlarge", "c5d.18xlarge", "c5d.24xlarge", "c5d.2xlarge", "c5d.4xlarge", "c5d.9xlarge", "c5d.large", "c5d.metal", "c5d.xlarge", "c5n.18xlarge", "c5n.2xlarge", "c5n.4xlarge", "c5n.9xlarge", "c5n.large", "c5n.xlarge",
  "cc1.4xlarge", "cc2.8xlarge", "cg1.4xlarge", "cr1.8xlarge",
  "d2.2xlarge", "d2.4xlarge", "d2.8xlarge", "d2.xlarge",
  "f1.16xlarge", "f1.2xlarge", "f1.4xlarge",
  "g2.2xlarge", "g2.8xlarge", "g3.16xlarge", "g3.4xlarge", "g3.8xlarge", "g3s.xlarge", "g4dn.12xlarge", "g4dn.16xlarge", "g4dn.2xlarge", "g4dn.4xlarge", "g4dn.8xlarge", "g4dn.xlarge",
  "h1.16xlarge", "h1.2xlarge", "h1.4xlarge", "h1.8xlarge", "hi1.4xlarge", "hs1.8xlarge",
  "i2.2xlarge", "i2.4xlarge", "i2.8xlarge", "i2.xlarge", "i3.16xlarge", "i3.2xlarge", "i3.4xlarge", "i3.8xlarge", "i3.large", "i3.metal", "i3.xlarge", "i3en.12xlarge", "i3en.24xlarge", "i3en.2xlarge", "i3en.3xlarge", "i3en.6xlarge", "i3en.large", "i3en.metal", "i3en.xlarge",
  "inf1.24xlarge", "inf1.2xlarge", "inf1.6xlarge", "inf1.xlarge",
  "m1.large", "m1.medium", "m1.small", "m1.xlarge", "m2.2xlarge", "m2.4xlarge", "m2.xlarge", "m3.2xlarge", "m3.large", "m3.medium", "m3.xlarge", "m4.10xlarge", "m4.16xlarge", "m4.2xlarge", "m4.4xlarge", "m4.large", "m4.xlarge", "m5.12xlarge", "m5.16xlarge", "m5.24xlarge", "m5.2xlarge", "m5.4xlarge", "m5.8xlarge", "m5.large", "m5.metal", "m5.xlarge", "m5a.12xlarge", "m5a.16xlarge", "m5a.24xlarge", "m5a.2xlarge", "m5a.4xlarge", "m5a.8xlarge", "m5a.large", "m5a.xlarge", "m5ad.12xlarge", "m5ad.16xlarge", "m5ad.24xlarge", "m5ad.2xlarge", "m5ad.4xlarge", "m5ad.8xlarge", "m5ad.large", "m5ad.xlarge", "m5d.12xlarge", "m5d.16xlarge", "m5d.24xlarge", "m5d.2xlarge", "m5d.4xlarge", "m5d.8xlarge", "m5d.large", "m5d.metal", "m5d.xlarge", "m5dn.12xlarge", "m5dn.16xlarge", "m5dn.24xlarge", "m5dn.2xlarge", "m5dn.4xlarge", "m5dn.8xlarge", "m5dn.large", "m5dn.xlarge", "m5n.12xlarge", "m5n.16xlarge", "m5n.24xlarge", "m5n.2xlarge", "m5n.4xlarge", "m5n.8xlarge", "m5n.large", "m5n.xlarge",
  "p2.16xlarge", "p2.8xlarge", "p2.xlarge", "p3.16xlarge", "p3.2xlarge", "p3.8xlarge", "p3dn.24xlarge",
  "r3.2xlarge", "r3.4xlarge", "r3.8xlarge", "r3.large", "r3.xlarge", "r4.16xlarge", "r4.2xlarge", "r4.4xlarge", "r4.8xlarge", "r4.large", "r4.xlarge", "r5.12xlarge", "r5.16xlarge", "r5.24xlarge", "r5.2xlarge", "r5.4xlarge", "r5.8xlarge", "r5.large", "r5.metal", "r5.xlarge", "r5a.12xlarge", "r5a.16xlarge", "r5a.24xlarge", "r5a.2xlarge", "r5a.4xlarge", "r5a.8xlarge", "r5a.large", "r5a.xlarge", "r5ad.12xlarge", "r5ad.16xlarge", "r5ad.24xlarge", "r5ad.2xlarge", "r5ad.4xlarge", "r5ad.8xlarge", "r5ad.large", "r5ad.xlarge", "r5d.12xlarge", "r5d.16xlarge", "r5d.24xlarge", "r5d.2xlarge", "r5d.4xlarge", "r5d.8xlarge", "r5d.large", "r5d.metal", "r5d.xlarge", "r5dn.12xlarge", "r5dn.16xlarge", "r5dn.24xlarge", "r5dn.2xlarge", "r5dn.4xlarge", "r5dn.8xlarge", "r5dn.large", "r5dn.xlarge", "r5n.12xlarge", "r5n.16xlarge", "r5n.24xlarge", "r5n.2xlarge", "r5n.4xlarge", "r5n.8xlarge", "r5n.large", "r5n.xlarge",
  "t1.micro", "t2.2xlarge", "t2.large", "t2.medium", "t2.micro", "t2.nano", "t2.small", "t2.xlarge", "t3.2xlarge", "t3.large", "t3.medium", "t3.micro", "t3.nano", "t3.small", "t3.xlarge", "t3a.2xlarge", "t3a.large", "t3a.medium", "t3a.micro", "t3a.nano", "t3a.small", "t3a.xlarge",
  "u-12tb1.metal", "u-18tb1.metal", "u-24tb1.metal", "u-6tb1.metal", "u-9tb1.metal", "x1.16xlarge", "x1.32xlarge", "x1e.16xlarge", "x1e.2xlarge", "x1e.32xlarge", "x1e.4xlarge", "x1e.8xlarge", "x1e.xlarge", "z1d.12xlarge", "z1d.2xlarge", "z1d.3xlarge", "z1d.6xlarge", "z1d.large", "z1d.metal", "z1d.xlarge"
]

General Purpose

All General Purpose Types

[
  "a1.2xlarge", "a1.4xlarge", "a1.large", "a1.medium", "a1.metal", "a1.xlarge",
  "t1.micro", "t2.2xlarge", "t2.large", "t2.medium", "t2.micro", "t2.nano", "t2.small", "t2.xlarge", "t3.2xlarge", "t3.large", "t3.medium", "t3.micro", "t3.nano", "t3.small", "t3.xlarge", "t3a.2xlarge", "t3a.large", "t3a.medium", "t3a.micro", "t3a.nano", "t3a.small", "t3a.xlarge",
  "m1.large", "m1.medium", "m1.small", "m1.xlarge", "m2.2xlarge", "m2.4xlarge", "m2.xlarge", "m3.2xlarge", "m3.large", "m3.medium", "m3.xlarge", "m4.10xlarge", "m4.16xlarge", "m4.2xlarge", "m4.4xlarge", "m4.large", "m4.xlarge", "m5.12xlarge", "m5.16xlarge", "m5.24xlarge", "m5.2xlarge", "m5.4xlarge", "m5.8xlarge", "m5.large", "m5.metal", "m5.xlarge", "m5a.12xlarge", "m5a.16xlarge", "m5a.24xlarge", "m5a.2xlarge", "m5a.4xlarge", "m5a.8xlarge", "m5a.large", "m5a.xlarge", "m5ad.12xlarge", "m5ad.16xlarge", "m5ad.24xlarge", "m5ad.2xlarge", "m5ad.4xlarge", "m5ad.8xlarge", "m5ad.large", "m5ad.xlarge", "m5d.12xlarge", "m5d.16xlarge", "m5d.24xlarge", "m5d.2xlarge", "m5d.4xlarge", "m5d.8xlarge", "m5d.large", "m5d.metal", "m5d.xlarge", "m5dn.12xlarge", "m5dn.16xlarge", "m5dn.24xlarge", "m5dn.2xlarge", "m5dn.4xlarge", "m5dn.8xlarge", "m5dn.large", "m5dn.xlarge", "m5n.12xlarge", "m5n.16xlarge", "m5n.24xlarge", "m5n.2xlarge", "m5n.4xlarge", "m5n.8xlarge", "m5n.large", "m5n.xlarge"
]

A Class Arm-Based Types

[
  "a1.2xlarge", "a1.4xlarge", "a1.large", "a1.medium", "a1.metal", "a1.xlarge"
]

T Class General Purpose Types

[
  "t1.micro",
  "t2.2xlarge", "t2.large", "t2.medium", "t2.micro", "t2.nano", "t2.small", "t2.xlarge",
  "t3.2xlarge", "t3.large", "t3.medium", "t3.micro", "t3.nano", "t3.small", "t3.xlarge",
  "t3a.2xlarge", "t3a.large", "t3a.medium", "t3a.micro", "t3a.nano", "t3a.small", "t3a.xlarge"
]

M Class General Purpose Types

[
  "m1.large", "m1.medium", "m1.small", "m1.xlarge",
  "m2.2xlarge", "m2.4xlarge", "m2.xlarge",
  "m3.2xlarge", "m3.large", "m3.medium", "m3.xlarge",
  "m4.10xlarge", "m4.16xlarge", "m4.2xlarge", "m4.4xlarge", "m4.large", "m4.xlarge",
  "m5.12xlarge", "m5.16xlarge", "m5.24xlarge", "m5.2xlarge", "m5.4xlarge", "m5.8xlarge", "m5.large", "m5.metal", "m5.xlarge",
  "m5a.12xlarge", "m5a.16xlarge", "m5a.24xlarge", "m5a.2xlarge", "m5a.4xlarge", "m5a.8xlarge", "m5a.large", "m5a.xlarge",
  "m5ad.12xlarge", "m5ad.16xlarge", "m5ad.24xlarge", "m5ad.2xlarge", "m5ad.4xlarge", "m5ad.8xlarge", "m5ad.large", "m5ad.xlarge",
  "m5d.12xlarge", "m5d.16xlarge", "m5d.24xlarge", "m5d.2xlarge", "m5d.4xlarge", "m5d.8xlarge", "m5d.large", "m5d.metal", "m5d.xlarge",
  "m5dn.12xlarge", "m5dn.16xlarge", "m5dn.24xlarge", "m5dn.2xlarge", "m5dn.4xlarge", "m5dn.8xlarge", "m5dn.large", "m5dn.xlarge",
  "m5n.12xlarge", "m5n.16xlarge", "m5n.24xlarge", "m5n.2xlarge", "m5n.4xlarge", "m5n.8xlarge", "m5n.large", "m5n.xlarge"
]

Compute Optimized

[
  "c1.medium", "c1.xlarge",
  "c3.2xlarge", "c3.4xlarge", "c3.8xlarge", "c3.large", "c3.xlarge",
  "c4.2xlarge", "c4.4xlarge", "c4.8xlarge", "c4.large", "c4.xlarge",
  "c5.12xlarge", "c5.18xlarge", "c5.24xlarge", "c5.2xlarge", "c5.4xlarge", "c5.9xlarge", "c5.large", "c5.metal", "c5.xlarge",
  "c5d.12xlarge", "c5d.18xlarge", "c5d.24xlarge", "c5d.2xlarge", "c5d.4xlarge", "c5d.9xlarge", "c5d.large", "c5d.metal", "c5d.xlarge",
  "c5n.18xlarge", "c5n.2xlarge", "c5n.4xlarge", "c5n.9xlarge", "c5n.large", "c5n.xlarge",
  "cc1.4xlarge", "cc2.8xlarge", "cg1.4xlarge", "cr1.8xlarge"
]

Memory Optimized

R Class Memory Optimized Types

[
  "r3.2xlarge", "r3.4xlarge", "r3.8xlarge", "r3.large", "r3.xlarge",
  "r4.16xlarge", "r4.2xlarge", "r4.4xlarge", "r4.8xlarge", "r4.large", "r4.xlarge",
  "r5.12xlarge", "r5.16xlarge", "r5.24xlarge", "r5.2xlarge", "r5.4xlarge", "r5.8xlarge", "r5.large", "r5.metal", "r5.xlarge",
  "r5a.12xlarge", "r5a.16xlarge", "r5a.24xlarge", "r5a.2xlarge", "r5a.4xlarge", "r5a.8xlarge", "r5a.large", "r5a.xlarge",
  "r5ad.12xlarge", "r5ad.16xlarge", "r5ad.24xlarge", "r5ad.2xlarge", "r5ad.4xlarge", "r5ad.8xlarge", "r5ad.large", "r5ad.xlarge",
  "r5d.12xlarge", "r5d.16xlarge", "r5d.24xlarge", "r5d.2xlarge", "r5d.4xlarge", "r5d.8xlarge", "r5d.large", "r5d.metal", "r5d.xlarge",
  "r5dn.12xlarge", "r5dn.16xlarge", "r5dn.24xlarge", "r5dn.2xlarge", "r5dn.4xlarge", "r5dn.8xlarge", "r5dn.large", "r5dn.xlarge",
  "r5n.12xlarge", "r5n.16xlarge", "r5n.24xlarge", "r5n.2xlarge", "r5n.4xlarge", "r5n.8xlarge", "r5n.large", "r5n.xlarge"
]

X Class Memory Optimized Types

[
  "x1.16xlarge", "x1.32xlarge",
  "x1e.16xlarge", "x1e.2xlarge", "x1e.32xlarge", "x1e.4xlarge", "x1e.8xlarge", "x1e.xlarge"
]

High Memory Class Memory Optimized Types

[
  "u-12tb1.metal", "u-18tb1.metal", "u-24tb1.metal", "u-6tb1.metal", "u-9tb1.metal"
]

Z Class Memory Optimized Types

[
  "z1d.12xlarge", "z1d.2xlarge", "z1d.3xlarge", "z1d.6xlarge", "z1d.large", "z1d.metal", "z1d.xlarge"
]

Accelerated Computing

P Class Accelerated Computing General Purpose GPU

[
  "p2.16xlarge", "p2.8xlarge", "p2.xlarge",
  "p3.16xlarge", "p3.2xlarge", "p3.8xlarge",
  "p3dn.24xlarge"
]

INF Class Accelerated Machine Learning Inference

[
  "inf1.24xlarge", "inf1.2xlarge", "inf1.6xlarge", "inf1.xlarge"
]

G Class Accelerated Computing GPU

[
  "g2.2xlarge", "g2.8xlarge",
  "g3.16xlarge", "g3.4xlarge", "g3.8xlarge", "g3s.xlarge",
  "g4dn.12xlarge", "g4dn.16xlarge", "g4dn.2xlarge", "g4dn.4xlarge", "g4dn.8xlarge", "g4dn.xlarge"
]

F Class Accelerated Computing FPGA Types

[
  "f1.16xlarge", "f1.2xlarge", "f1.4xlarge"
]

Storage Optimized

I Class Storage Optimized SSD-Backed Types

[
  "i2.2xlarge", "i2.4xlarge", "i2.8xlarge", "i2.xlarge",
  "i3.16xlarge", "i3.2xlarge", "i3.4xlarge", "i3.8xlarge", "i3.large", "i3.metal", "i3.xlarge",
  "i3en.12xlarge", "i3en.24xlarge", "i3en.2xlarge", "i3en.3xlarge", "i3en.6xlarge", "i3en.large", "i3en.metal", "i3en.xlarge"
]

D Class Storage Optimized HDD-Backed Types

[
  "d2.2xlarge", "d2.4xlarge", "d2.8xlarge", "d2.xlarge"
]

H Class Storage Optimized HDD-Backed Types

[
  "h1.16xlarge", "h1.2xlarge", "h1.4xlarge", "h1.8xlarge", "hi1.4xlarge", "hs1.8xlarge"
]