diff --git a/CHANGELOG.md b/CHANGELOG.md
index f1d651b..b8a2bb3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ For major (breaking) changes - version 3 and 2 see end of page.
 
 | Version        | Date           | Comment  |
 | -------------- | -------------- | -------- |
+| 4.31.0         | 2020-12-06     | `osInfo()` added FQDN |
 | 4.30.11        | 2020-12-02     | `cpu()` bug fix speed parsing |
 | 4.30.10        | 2020-12-01     | `cpu()` handled speed parsing error (Apple Silicon) |
 | 4.30.9         | 2020-12-01     | `cpu()` corrected processor names (Raspberry Pi) |
diff --git a/README.md b/README.md
index 47f74bf..f918b26 100644
--- a/README.md
+++ b/README.md
@@ -93,6 +93,7 @@ si.cpu()
 
 (last 7 major and minor version releases)
 
+- Version 4.31.0: `osInfo()` added FQDN
 - Version 4.30.0: `get()` added possibility to provide parameters
 - Version 4.29.0: `fsSize()` correct fs type detection macOS (HFS, APFS, NFS)
 - Version 4.28.0: `graphics()` added deviceName (Windows)
@@ -100,7 +101,6 @@ si.cpu()
 - Version 4.26.0: `diskLayout()` added full S.M.A.R.T data (Linux)
 - Version 4.25.0: `get()` added function to get partial system info
 - Version 4.24.0: `networkInterfaces()` added subnet mask ip4 and ip6
-- Version 4.23.0: `versions()` added param to specify which program/lib versions to detect
 - ...
 
 You can find all changes here: [detailed changelog][changelog-url]
@@ -298,6 +298,7 @@ I also created a nice little command line tool called [mmon][mmon-github-url] (m
 | | kernel | X | X | X | X | X | kernel release - same as os.release() |
 | | arch | X | X | X | X | X | same as os.arch() |
 | | hostname | X | X | X | X | X | same as os.hostname() |
+| | fqdn | X | X | X | X | X | FQDN fully qualified domain name |
 | | codepage | X | X | X | X |   | OS build version |
 | | logofile | X | X | X | X | X | e.g. 'apple', 'debian', 'fedora', ... |
 | | serial | X | X | X | X |   | OS/Host serial number |
diff --git a/docs/history.html b/docs/history.html
index 0a80223..3329992 100644
--- a/docs/history.html
+++ b/docs/history.html
@@ -83,6 +83,11 @@
                   </tr>
                 </thead>
                 <tbody>
+                  <tr>
+                    <th scope="row">4.31.0</th>
+                    <td>2020-12-06</td>
+                    <td><span class="code">osInfo()</span> added FQDN</td>
+                  </tr>
                   <tr>
                     <th scope="row">4.30.11</th>
                     <td>2020-12-02</td>
diff --git a/docs/index.html b/docs/index.html
index 830a013..83918cd 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -169,7 +169,7 @@
       <img class="logo" src="assets/logo.png">
       <div class="title">systeminformation</div>
       <div class="subtitle"><span id="typed"></span></div>
-      <div class="version">Current Version: <span id="version">4.30.11</span></div>
+      <div class="version">Current Version: <span id="version">4.31.0</span></div>
       <button class="btn btn-light" onclick="location.href='https://github.com/sebhildebrandt/systeminformation'">View on Github <i class=" fab fa-github"></i></button>
     </div>
     <div class="down">
@@ -208,7 +208,7 @@
         <div class="title">Downloads last month</div>
       </div>
       <div class="col-xl-4 col-lg-4 col-md-4 col-12">
-        <div class="numbers">359</div>
+        <div class="numbers">364</div>
         <div class="title">Dependents</div>
       </div>
     </div>
diff --git a/docs/os.html b/docs/os.html
index 0e0aba5..a22ea87 100644
--- a/docs/os.html
+++ b/docs/os.html
@@ -145,6 +145,16 @@
                     <td>X</td>
                     <td>same as os.hostname()</td>
                   </tr>
+                  <tr>
+                    <td></td>
+                    <td>fqdn</td>
+                    <td>X</td>
+                    <td>X</td>
+                    <td>X</td>
+                    <td>X</td>
+                    <td>X</td>
+                    <td>fully qualfied domain name</td>
+                  </tr>
                   <tr>
                     <td></td>
                     <td>codepage</td>
@@ -220,6 +230,7 @@ si.osInfo().then(data => console.log(data));</code></pre class="example">
   kernel: '19.3.0',
   arch: 'x64',
   hostname: 'hostname.local',
+  fqdn: 'hostname.local',
   codepage: 'UTF-8',
   logofile: 'apple',
   serial: 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX',
diff --git a/lib/index.d.ts b/lib/index.d.ts
index e3b96be..47ba3c4 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -285,6 +285,7 @@ export namespace Systeminformation {
     kernel: string;
     arch: string;
     hostname: string;
+    fqdn: string;
     codepage: string;
     logofile: string;
     serial: string;
diff --git a/lib/osinfo.js b/lib/osinfo.js
index 446ea1c..734c318 100644
--- a/lib/osinfo.js
+++ b/lib/osinfo.js
@@ -17,6 +17,7 @@ const os = require('os');
 const exec = require('child_process').exec;
 const util = require('./util');
 const fs = require('fs');
+const { execSync } = require('child_process');
 
 let _platform = process.platform;
 
@@ -160,6 +161,30 @@ function getLogoFile(distro) {
   return result;
 }
 
+// --------------------------
+// FQDN
+
+function getFQDN() {
+  let fqdn = os.hostname;
+  if (_linux || _darwin || _freebsd || _openbsd || _netbsd) {
+    try {
+      const stdout = execSync('hostname -f');
+      fqdn = stdout.toString().split(os.EOL)[0];
+    } catch (e) {
+      util.noop();
+    }
+  }
+  if (_windows) {
+    try {
+      const stdout = execSync('echo %COMPUTERNAME%.%USERDNSDOMAIN%');
+      fqdn = stdout.toString().split(os.EOL)[0];
+    } catch (e) {
+      util.noop();
+    }
+  }
+  return fqdn;
+}
+
 // --------------------------
 // OS Information
 
@@ -176,6 +201,7 @@ function osInfo(callback) {
         kernel: os.release(),
         arch: os.arch(),
         hostname: os.hostname(),
+        fqdn: getFQDN(),
         codepage: '',
         logofile: '',
         serial: '',