diff --git a/ipinfo/cmd_tool.go b/ipinfo/cmd_tool.go
index 61db331a..2d81f483 100644
--- a/ipinfo/cmd_tool.go
+++ b/ipinfo/cmd_tool.go
@@ -14,6 +14,7 @@ var completionsTool = &complete.Command{
 		"aggregate": completionsToolAggregate,
 		"lower":     completionsToolLower,
 		"upper":     completionsToolUpper,
+		"is_v6":     completionsToolIsV6,
 		"ip2n":      completionsToolIP2n,
 		"n2ip":      completionsToolN2IP,
 		"n2ip6":     completionsToolN2IP6,
@@ -33,6 +34,7 @@ Commands:
   aggregate    aggregate IPs, IP ranges, and CIDRs.
   lower        get start IP of IPs, IP ranges, and CIDRs.
   upper        get end IP of IPs, IP ranges, and CIDRs.
+  is_v6        check if IPs are IPv6.
   ip2n         converts an IPv4 or IPv6 address to its decimal representation.
   n2ip	       evaluates a mathematical expression and converts it to an IPv4 or IPv6.
   n2ip6	       evaluates a mathematical expression and converts it to an IPv6.
@@ -70,6 +72,8 @@ func cmdTool() error {
 		err = cmdToolLower()
 	case cmd == "upper":
 		err = cmdToolUpper()
+	case cmd == "is_v6":
+		err = cmdToolIsV6()
 	case cmd == "ip2n":
 		err = cmdToolIP2n()
 	case cmd == "n2ip":
diff --git a/ipinfo/cmd_tool_is_v6.go b/ipinfo/cmd_tool_is_v6.go
new file mode 100644
index 00000000..aa2a8283
--- /dev/null
+++ b/ipinfo/cmd_tool_is_v6.go
@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"github.com/ipinfo/cli/lib"
+	"github.com/ipinfo/cli/lib/complete"
+	"github.com/ipinfo/cli/lib/complete/predict"
+	"github.com/spf13/pflag"
+)
+
+var completionsToolIsV6 = &complete.Command{
+	Flags: map[string]complete.Predictor{
+		"-h":     predict.Nothing,
+		"--help": predict.Nothing,
+	},
+}
+
+func printHelpToolIsV6() {
+	fmt.Printf(
+		`Usage: %s tool is_v6 <ip>
+
+Description:
+  check if IPs are IPv6.
+
+Examples:
+  $ %[1]s tool is_v6 "2001:0db8:85a3:0000:0000:8a2e:0370:7334"
+  $ %[1]s tool is_v6 "2001:0db8:85a3::8a2e:0370:7334"
+  $ %[1]s tool is_v6 "::7334"
+
+Options:
+  General:
+    --help, -h
+      show help.
+`, progBase)
+}
+
+func cmdToolIsV6() error {
+	f := lib.CmdToolIsV6Flags{}
+	f.Init()
+	pflag.Parse()
+
+	return lib.CmdToolIsV6(f, pflag.Args()[2:], printHelpToolIsV6)
+}
diff --git a/lib/cmd_tool_is_v6.go b/lib/cmd_tool_is_v6.go
new file mode 100644
index 00000000..a7adef21
--- /dev/null
+++ b/lib/cmd_tool_is_v6.go
@@ -0,0 +1,34 @@
+package lib
+
+import (
+	"fmt"
+	"github.com/spf13/pflag"
+)
+
+// CmdToolIsV6Flags are flags expected by CmdToolIsV6.
+type CmdToolIsV6Flags struct {
+	Help bool
+}
+
+// Init initializes the common flags available to CmdToolIsV6 with sensible
+func (f *CmdToolIsV6Flags) Init() {
+	pflag.BoolVarP(
+		&f.Help,
+		"help", "h", false,
+		"show help.",
+	)
+}
+
+func CmdToolIsV6(f CmdToolIsV6Flags, args []string, printHelp func()) error {
+	if f.Help {
+		printHelp()
+		return nil
+	}
+
+	op := func(input string, input_type INPUT_TYPE) error {
+		fmt.Printf("%s %t\n", input, StrIsIPv6Str(input))
+		return nil
+	}
+
+	return GetInputFrom(args, true, true, op)
+}