diff --git a/src/index.ts b/src/index.ts
index ce6f811..7a50f05 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,7 @@
 import childProcess from 'child_process'
 import yaml from 'yaml'
+import mapPorts from './port-mapper'
+
 export interface IDockerComposeOptions {
   cwd?: string
   executablePath?: string
@@ -75,33 +77,6 @@ export type DockerComposePsResult = {
   }>
 }
 
-export const mapPorts = (
-  ports: string
-): Array<{
-  mapped?: { address: string; port: number }
-  exposed: { port: number; protocol: string }
-}> => {
-  const result = !ports
-    ? []
-    : (() => {
-        return ports.split(',').map((untypedPort) => {
-          const exposedFragments = untypedPort.trim().split('->')
-          const [port, protocol] =
-            exposedFragments.length === 1
-              ? exposedFragments[0].split('/')
-              : exposedFragments[1].split('/')
-          const [address, mappedPort] =
-            exposedFragments.length === 2 ? exposedFragments[0].split(':') : []
-          return {
-            exposed: { port: Number(port), protocol },
-            ...(address &&
-              mappedPort && { mapped: { port: Number(mappedPort), address } })
-          }
-        })
-      })()
-  return result
-}
-
 export const mapPsOutput = (output: string): DockerComposePsResult => {
   const services = output
     .split(`\n`)
@@ -514,3 +489,5 @@ export const version = async function (
     return Promise.reject(error)
   }
 }
+
+export { mapPorts }
diff --git a/src/port-mapper.ts b/src/port-mapper.ts
new file mode 100644
index 0000000..f7c3d11
--- /dev/null
+++ b/src/port-mapper.ts
@@ -0,0 +1,31 @@
+const mapPorts = (
+  ports: string
+): Array<{
+  mapped?: { address: string; port: number }
+  exposed: { port: number; protocol: string }
+}> => {
+  const result = !ports
+    ? []
+    : (() => {
+      return ports.split(',').map((untypedPort) => {
+        const exposedFragments = untypedPort.trim().split('->')
+
+        console.log(exposedFragments)
+
+        const [port, protocol] =
+          exposedFragments.length === 1
+            ? exposedFragments[0].split('/')
+            : exposedFragments[1].split('/')
+        const [address, mappedPort] =
+          exposedFragments.length === 2 ? exposedFragments[0].split(':') : []
+        return {
+          exposed: { port: Number(port), protocol },
+          ...(address &&
+            mappedPort && { mapped: { port: Number(mappedPort), address } })
+        }
+      })
+    })()
+  return result
+}
+
+export default mapPorts
diff --git a/test/docker-compose.yml b/test/docker-compose.yml
index 059a017..1d4794a 100644
--- a/test/docker-compose.yml
+++ b/test/docker-compose.yml
@@ -6,8 +6,8 @@ services:
     container_name: compose_test_web
     command: 'nginx -g "daemon off;"'
     ports: 
-      - 80:80
-      - 443:443
+      - '0.0.0.0:80:80'
+      - '0.0.0.0:443:443'
   proxy:
     image: nginx:1.19.9-alpine
     container_name: compose_test_proxy
diff --git a/test/index.test.ts b/test/index.test.ts
index de96b82..4ba4fc7 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -699,31 +699,3 @@ test('parse ps output', () => {
     ]
   })
 })
-
-test('map ports', () => {
-  const noPort = ''
-  const exposedTcp = '80/tcp'
-  const mappedExposedTcp = '0.0.0.0:443->443/tcp'
-  const multipleExposedMappedTcp = '0.0.0.0:443->443/tcp, 0.0.0.0:80->80/tcp'
-
-  expect(mapPorts(noPort)).toEqual([])
-  expect(mapPorts(exposedTcp)).toEqual([
-    { exposed: { port: 80, protocol: 'tcp' } }
-  ])
-  expect(mapPorts(mappedExposedTcp)).toEqual([
-    {
-      exposed: { port: 443, protocol: 'tcp' },
-      mapped: { address: '0.0.0.0', port: 443 }
-    }
-  ])
-  expect(mapPorts(multipleExposedMappedTcp)).toEqual([
-    {
-      exposed: { port: 443, protocol: 'tcp' },
-      mapped: { address: '0.0.0.0', port: 443 }
-    },
-    {
-      exposed: { port: 80, protocol: 'tcp' },
-      mapped: { address: '0.0.0.0', port: 80 }
-    }
-  ])
-})
diff --git a/test/port-mapper.test.ts b/test/port-mapper.test.ts
new file mode 100644
index 0000000..405c794
--- /dev/null
+++ b/test/port-mapper.test.ts
@@ -0,0 +1,54 @@
+import mapPorts from "../src/port-mapper";
+
+test('map ports for empty string', () => {
+  expect(mapPorts('')).toEqual([])
+})
+
+test('map ports for exposed tcp', () => {
+  expect(mapPorts('80/tcp')).toEqual([
+    { exposed: { port: 80, protocol: 'tcp' } }
+  ])
+})
+
+test('map ports for exposed tcp on ivp4 interface', () => {
+  expect(mapPorts('0.0.0.0:443->443/tcp')).toEqual([
+    {
+      exposed: { port: 443, protocol: 'tcp' },
+      mapped: { address: '0.0.0.0', port: 443 }
+    }
+  ])
+})
+
+test('map multiple tcp ports exposed on ivp4 interfaces', () => {
+  expect(mapPorts('0.0.0.0:443->443/tcp, 0.0.0.0:80->80/tcp')).toEqual([
+    {
+      exposed: { port: 443, protocol: 'tcp' },
+      mapped: { address: '0.0.0.0', port: 443 }
+    },
+    {
+      exposed: { port: 80, protocol: 'tcp' },
+      mapped: { address: '0.0.0.0', port: 80 }
+    }
+  ])
+})
+
+test('map multiple tcp ports exposed on ipv4 and ipv6 interfaces', () => {
+  expect(mapPorts('0.0.0.0:443->443/tcp,:::443->443/tcp, 0.0.0.0:80->80/tcp,:::80->80/tcp')).toEqual([
+    {
+      exposed: { port: 443, protocol: 'tcp' },
+      mapped: { address: '0.0.0.0', port: 443 },
+    },
+    {
+      exposed: { port: 443, protocol: 'tcp' },
+      mapped: { address: ':::', port: 443 },
+    },
+    {
+      exposed: { port: 80, protocol: 'tcp' },
+      mapped: { address: '0.0.0.0', port: 80 },
+    },
+    {
+      exposed: { port: 80, protocol: 'tcp' },
+      mapped: { address: ':::', port: 80 },
+    },
+  ])
+})