diff --git a/components/Reference.tsx b/components/Reference.tsx
index ced939b6..b9e2ce54 100644
--- a/components/Reference.tsx
+++ b/components/Reference.tsx
@@ -6,30 +6,15 @@ import { IOpcode } from 'types'
 
 import { EthereumContext } from 'context/ethereumContext'
 
+import { hardforkColor } from 'util/opcodes'
 import { isEmpty } from 'util/string'
 
 import { StackBox } from 'components/ui'
 
-type GroupLabel = {
-  [group: string]: string
-}
-
 type CustomHeaderGroup = {
   className?: string
 } & HeaderGroup<IOpcode>
 
-const groupLabels: GroupLabel = {
-  'Stop and Arithmetic Operations': 'Stop & Arithmetic',
-  'Comparison & Bitwise Logic Operations': 'Comparison & Bitwise',
-  'Environmental Information': 'Environment',
-  'Block Information': 'Block',
-  'Stack Memory Storage and Flow Operations': 'Stack & Memory',
-  'Push Operations': 'Push',
-  'Duplication Operations': 'Duplication',
-  'Exchange Operations': 'Exchange',
-  'System operations': 'System',
-}
-
 const columnsData = [
   {
     Header: 'Opcode',
@@ -68,20 +53,39 @@ const columnsData = [
     className: 'hidden lg:table-cell',
   },
   {
-    Header: 'Group',
-    accessor: 'group',
+    Header: 'Fork',
+    accessor: 'fork',
     Cell: ({ value }: { value: string }) => {
-      const label = groupLabels[value]
-      return isEmpty(label) ? (
+      return isEmpty(value) ? (
         ''
       ) : (
-        <span className="bg-gray-200 rounded-full px-4 py-1 text-2xs uppercase font-medium whitespace-nowrap">
-          {label}
+        <span
+          className={cn(
+            'bg-gray-200 rounded-full px-4 py-1 text-2xs uppercase font-medium whitespace-nowrap',
+            hardforkColor[value],
+          )}
+        >
+          {value}
         </span>
       )
     },
-    className: 'hidden lg:table-cell',
   },
+  // FIXME: Move into opcode details page
+  // {
+  //   Header: 'Group',
+  //   accessor: 'group',
+  //   Cell: ({ value }: { value: string }) => {
+  //     const label = groupLabels[value]
+  //     return isEmpty(label) ? (
+  //       ''
+  //     ) : (
+  //       <span className="bg-gray-200 rounded-full px-4 py-1 text-2xs uppercase font-medium whitespace-nowrap">
+  //         {label}
+  //       </span>
+  //     )
+  //   },
+  //   className: 'hidden lg:table-cell',
+  // },
 ]
 
 const ReferenceTable = () => {
diff --git a/context/ethereumContext.tsx b/context/ethereumContext.tsx
index a404973c..b131797c 100644
--- a/context/ethereumContext.tsx
+++ b/context/ethereumContext.tsx
@@ -19,6 +19,7 @@ import {
   IChain,
 } from 'types'
 
+import { getHardfork } from 'util/opcodes'
 import { toHex, fromBuffer } from 'util/string'
 
 let vm: VM
@@ -377,6 +378,7 @@ export const EthereumProvider: React.FC<{}> = ({ children }) => {
           code: toHex(op.code),
           fee: op.fee,
           name: op.fullName,
+          fork: getHardfork(op.code),
         },
       })
     })
diff --git a/util/opcodes.ts b/util/opcodes.ts
new file mode 100644
index 00000000..0c1298f5
--- /dev/null
+++ b/util/opcodes.ts
@@ -0,0 +1,111 @@
+type GroupLabel = {
+  [group: string]: string
+}
+
+type ForkColor = {
+  [fork: string]: string
+}
+
+export const groupLabels: GroupLabel = {
+  'Stop and Arithmetic Operations': 'Stop & Arithmetic',
+  'Comparison & Bitwise Logic Operations': 'Comparison & Bitwise',
+  'Environmental Information': 'Environment',
+  'Block Information': 'Block',
+  'Stack Memory Storage and Flow Operations': 'Stack & Memory',
+  'Push Operations': 'Push',
+  'Duplication Operations': 'Duplication',
+  'Exchange Operations': 'Exchange',
+  'System operations': 'System',
+}
+
+export const hardforkColor: ForkColor = {
+  chainstart: 'bg-ping-300',
+  homestead: 'bg-purple-300',
+  dao: 'bg-indigo-300',
+  tangerineWhistle: 'bg-blue-300',
+  spuriousDragon: 'bg-green-300',
+  byzantium: 'bg-yellow-300',
+  constantinople: 'bg-red-300',
+  petersburg: 'bg-orange-300',
+  istanbul: 'bg-teal-300',
+  muirGlacier: 'bg-sky-300',
+  berlin: 'bg-violet-300',
+  london: 'bg-rose-300',
+  merge: 'bg-fuchsia-300',
+  shanghai: 'bg-lime-300',
+}
+
+// Combine values of `hardforkOpcodes` and `eipOpcodes`
+// See: https://github.com/ethereumjs/ethereumjs-monorepo/blob/master/packages/vm/src/evm/opcodes/codes.ts#L197
+
+const hardforkOpcodes = [
+  {
+    hardforkName: 'homestead',
+    opcodes: {
+      0xf4: { name: 'DELEGATECALL', isAsync: true }, // EIP 7
+    },
+  },
+  {
+    hardforkName: 'tangerineWhistle',
+    opcodes: {
+      0x54: { name: 'SLOAD', isAsync: true },
+      0xf1: { name: 'CALL', isAsync: true },
+      0xf2: { name: 'CALLCODE', isAsync: true },
+      0x3b: { name: 'EXTCODESIZE', isAsync: true },
+      0x3c: { name: 'EXTCODECOPY', isAsync: true },
+      0xf4: { name: 'DELEGATECALL', isAsync: true }, // EIP 7
+      0xff: { name: 'SELFDESTRUCT', isAsync: true },
+      0x31: { name: 'BALANCE', isAsync: true },
+    },
+  },
+  {
+    hardforkName: 'byzantium',
+    opcodes: {
+      0xfd: { name: 'REVERT', isAsync: false }, // EIP 140
+      0xfa: { name: 'STATICCALL', isAsync: true }, // EIP 214
+      0x3d: { name: 'RETURNDATASIZE', isAsync: true }, // EIP 211
+      0x3e: { name: 'RETURNDATACOPY', isAsync: true }, // EIP 211
+    },
+  },
+  {
+    hardforkName: 'constantinople',
+    opcodes: {
+      0x1b: { name: 'SHL', isAsync: false }, // EIP 145
+      0x1c: { name: 'SHR', isAsync: false }, // EIP 145
+      0x1d: { name: 'SAR', isAsync: false }, // EIP 145
+      0x3f: { name: 'EXTCODEHASH', isAsync: true }, // EIP 1052
+      0xf5: { name: 'CREATE2', isAsync: true }, // EIP 1014
+    },
+  },
+  {
+    hardforkName: 'istanbul',
+    opcodes: {
+      0x46: { name: 'CHAINID', isAsync: false }, // EIP 1344
+      0x47: { name: 'SELFBALANCE', isAsync: false }, // EIP 1884
+    },
+  },
+  {
+    hardforkName: 'berlin',
+    opcodes: {
+      0x5c: { name: 'BEGINSUB', isAsync: false },
+      0x5d: { name: 'RETURNSUB', isAsync: false },
+      0x5e: { name: 'JUMPSUB', isAsync: false },
+    },
+  },
+  {
+    hardforkName: 'london',
+    opcodes: {
+      0x48: { name: 'BASEFEE', isAsync: false },
+    },
+  },
+]
+
+/**
+ * Finds a hardfork for a given opcode
+ * @param opcode The decimal number opcode
+ * @returns The hard fork name
+ */
+export const getHardfork = (opcode: number) => {
+  const foundFork = hardforkOpcodes.find((fork) => opcode in fork.opcodes)
+  return foundFork ? foundFork.hardforkName : null
+}