diff --git a/README.md b/README.md
index cc6e0ad4..30f49092 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ brew install ipinfo-cli
 OR to install the latest `amd64` version without automatic updates:
 
 ```bash
-curl -Ls https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.1/macos.sh | sh
+curl -Ls https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.2/macos.sh | sh
 ```
 
 ### Ubuntu PPA
@@ -43,14 +43,14 @@ _Note_: this is a one-time installation; updates are not automatic. Use the PPA
 for automatic updates.
 
 ```bash
-curl -Ls https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.1/deb.sh | sh
+curl -Ls https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.2/deb.sh | sh
 ```
 
 OR
 
 ```bash
-curl -LO https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.1/ipinfo_3.1.1.deb
-sudo dpkg -i ipinfo_3.1.1.deb
+curl -LO https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.2/ipinfo_3.1.2.deb
+sudo dpkg -i ipinfo_3.1.2.deb
 ```
 
 ### FreeBSD
@@ -71,7 +71,7 @@ makepkg -si
 _Note_: run powershell as administrator before executing this command.
 
 ```bash
-iwr -useb https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.1/windows.ps1 | iex
+iwr -useb https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.2/windows.ps1 | iex
 ```
 
 ### Scoop
@@ -83,7 +83,7 @@ scoop install ipinfo-cli
 ### Docker
 
 ```bash
-docker run --rm -it ipinfo/ipinfo:3.1.1
+docker run --rm -it ipinfo/ipinfo:3.1.2
 ```
 
 To save the CLI's config, add `-v "/path_to_config:/root/.config/ipinfo"`. For
@@ -91,7 +91,7 @@ example, the following command saves the config to the `ipinfo` directory in
 the current working directory.
 
 ```bash
-docker run --rm -it -v "$PWD/ipinfo:/root/.config/ipinfo" ipinfo/ipinfo:3.1.1
+docker run --rm -it -v "$PWD/ipinfo:/root/.config/ipinfo" ipinfo/ipinfo:3.1.2
 ```
 
 ### Using `go install`
@@ -142,12 +142,12 @@ After choosing a platform `PLAT` from above, run:
 
 ```bash
 # for Windows, use ".zip" instead of ".tar.gz"
-curl -LO https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.1/ipinfo_3.1.1_${PLAT}.tar.gz
+curl -LO https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.2/ipinfo_3.1.2_${PLAT}.tar.gz
 # OR
-wget https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.1/ipinfo_3.1.1_${PLAT}.tar.gz
+wget https://github.com/ipinfo/cli/releases/download/ipinfo-3.1.2/ipinfo_3.1.2_${PLAT}.tar.gz
 
-tar -xvf ipinfo_3.1.1_${PLAT}.tar.gz
-mv ipinfo_3.1.1_${PLAT} /usr/local/bin/ipinfo
+tar -xvf ipinfo_3.1.2_${PLAT}.tar.gz
+mv ipinfo_3.1.2_${PLAT} /usr/local/bin/ipinfo
 ```
 
 ### Using `git`
diff --git a/debian/changelog b/debian/changelog
index 8ab88ed3..9d0dfd17 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,5 +1,5 @@
-ipinfo (3.1.1) focal; urgency=medium
+ipinfo (3.1.2) focal; urgency=medium
 
-  * 3.1.1 release.
+  * 3.1.2 release.
 
  -- usama <support@ipinfo.io>  Mon, 07 Aug 2023 12:36:18 +0500
diff --git a/debian/files b/debian/files
index 21bff3cc..d67fdaec 100644
--- a/debian/files
+++ b/debian/files
@@ -1 +1 @@
-ipinfo_3.1.1_source.buildinfo utils optional
+ipinfo_3.1.2_source.buildinfo utils optional
diff --git a/ipinfo/CHANGELOG.md b/ipinfo/CHANGELOG.md
index 7b3b43f2..fdf1b8f5 100644
--- a/ipinfo/CHANGELOG.md
+++ b/ipinfo/CHANGELOG.md
@@ -1,3 +1,16 @@
+# 3.1.2
+
+* `ipinfo tool prefix` introduced with some misc. prefix tools. Currently supports following subcommands:
+    - `addr` returns the base IP address of a prefix.
+    - `bits` returns the length of a prefix and reports `-1` if invalid.
+    - `masked` returns canonical form of a prefix, masking off non-high bits, and returns the zero if invalid.
+    - `is_valid` reports whether a prefix is valid.
+
+## Pull Requests
+
+* [#179](https://github.com/ipinfo/cli/pull/179)
+* [#180](https://github.com/ipinfo/cli/pull/180)
+
 # 3.1.1
 
 * Fixed return errors in IP parsing generic funcs.
diff --git a/ipinfo/deb.sh b/ipinfo/deb.sh
index 10f37a43..444a522b 100755
--- a/ipinfo/deb.sh
+++ b/ipinfo/deb.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-VSN=3.1.1
+VSN=3.1.2
 
 curl -LO https://github.com/ipinfo/cli/releases/download/ipinfo-${VSN}/ipinfo_${VSN}.deb
 sudo dpkg -i ipinfo_${VSN}.deb
diff --git a/ipinfo/dist/DEBIAN/control b/ipinfo/dist/DEBIAN/control
index c18d63dd..06708767 100644
--- a/ipinfo/dist/DEBIAN/control
+++ b/ipinfo/dist/DEBIAN/control
@@ -1,6 +1,6 @@
 Source: ipinfo
 Section: utils
-Version: 3.1.1
+Version: 3.1.2
 Priority: optional
 Maintainer: IPinfo <support@ipinfo.io>
 Vcs-Git: https://github.com/ipinfo/cli
diff --git a/ipinfo/macos.sh b/ipinfo/macos.sh
index 99c9a0e7..de0fef9a 100755
--- a/ipinfo/macos.sh
+++ b/ipinfo/macos.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-VSN=3.1.1
+VSN=3.1.2
 PLAT=darwin_amd64
 
 curl -LO https://github.com/ipinfo/cli/releases/download/ipinfo-${VSN}/ipinfo_${VSN}_${PLAT}.tar.gz
diff --git a/ipinfo/main.go b/ipinfo/main.go
index 3c5fcf65..49acfda5 100644
--- a/ipinfo/main.go
+++ b/ipinfo/main.go
@@ -11,7 +11,7 @@ import (
 )
 
 var progBase = filepath.Base(os.Args[0])
-var version = "3.1.1"
+var version = "3.1.2"
 
 // global flags.
 var fHelp bool
diff --git a/ipinfo/windows.ps1 b/ipinfo/windows.ps1
index 5a25388e..40d59b66 100644
--- a/ipinfo/windows.ps1
+++ b/ipinfo/windows.ps1
@@ -1,4 +1,4 @@
-$VSN = "3.1.1"
+$VSN = "3.1.2"
 
 # build the filename for the Zip archive and exe file
 $FileName = "ipinfo_$($VSN)_windows_amd64"