diff --git a/agent/agent.go b/agent/agent.go
index d8ce397363..d1b0dd7fc1 100644
--- a/agent/agent.go
+++ b/agent/agent.go
@@ -58,6 +58,7 @@ type delegate interface {
 	GetLANCoordinate() (lib.CoordinateSet, error)
 	Leave() error
 	LANMembers() []serf.Member
+	LANMembersAllSegments() ([]serf.Member, error)
 	LANSegmentMembers(segment string) ([]serf.Member, error)
 	LocalMember() serf.Member
 	JoinLAN(addrs []string) (n int, err error)
diff --git a/agent/agent_endpoint.go b/agent/agent_endpoint.go
index 18b26df010..0fbf65c522 100644
--- a/agent/agent_endpoint.go
+++ b/agent/agent_endpoint.go
@@ -167,14 +167,12 @@ func (s *HTTPServer) AgentMembers(resp http.ResponseWriter, req *http.Request) (
 	if wan {
 		members = s.agent.WANMembers()
 	} else {
-		// If the segment is blank when querying a client, use the agent's
-		// segment instead of the empty string.
-		if !s.agent.config.Server && segment == "" {
-			segment = s.agent.config.Segment
-		}
-
 		var err error
-		members, err = s.agent.delegate.LANSegmentMembers(segment)
+		if segment == api.AllSegments {
+			members, err = s.agent.delegate.LANMembersAllSegments()
+		} else {
+			members, err = s.agent.delegate.LANSegmentMembers(segment)
+		}
 		if err != nil {
 			return nil, err
 		}
diff --git a/agent/consul/client.go b/agent/consul/client.go
index 35badda4a6..87fe32e11a 100644
--- a/agent/consul/client.go
+++ b/agent/consul/client.go
@@ -201,6 +201,11 @@ func (c *Client) LANMembers() []serf.Member {
 	return c.serf.Members()
 }
 
+// LANMembersAllSegments returns members from all segments.
+func (c *Client) LANMembersAllSegments() ([]serf.Member, error) {
+	return c.serf.Members(), nil
+}
+
 // LANSegmentMembers only returns our own segment's members, because clients
 // can't be in multiple segments.
 func (c *Client) LANSegmentMembers(segment string) ([]serf.Member, error) {
diff --git a/agent/consul/segment_stub.go b/agent/consul/segment_stub.go
index 7b2ed66174..9b89ecb795 100644
--- a/agent/consul/segment_stub.go
+++ b/agent/consul/segment_stub.go
@@ -9,6 +9,11 @@ import (
 	"github.com/hashicorp/serf/serf"
 )
 
+// LANMembersAllSegments returns members from all segments.
+func (s *Server) LANMembersAllSegments() ([]serf.Member, error) {
+	return s.LANMembers(), nil
+}
+
 // LANSegmentMembers is used to return the members of the given LAN segment.
 func (s *Server) LANSegmentMembers(segment string) ([]serf.Member, error) {
 	if segment == "" {
diff --git a/api/agent.go b/api/agent.go
index e46bb90434..ac57415c15 100644
--- a/api/agent.go
+++ b/api/agent.go
@@ -44,12 +44,16 @@ type AgentMember struct {
 	DelegateCur uint8
 }
 
+// AllSegments is used to select for all segments in MembersOpts.
+const AllSegments = "_all"
+
 // MembersOpts is used for querying member information.
 type MembersOpts struct {
 	// WAN is whether to show members from the WAN.
 	WAN bool
 
-	// Segment is the LAN segment to show members.
+	// Segment is the LAN segment to show members for. Setting this to the
+	// AllSegments value above will show members in all segments.
 	Segment string
 }
 
diff --git a/command/members.go b/command/members.go
index f12912a4bb..1e69c0dcf2 100644
--- a/command/members.go
+++ b/command/members.go
@@ -44,7 +44,7 @@ func (c *MembersCommand) Run(args []string) int {
 	f.StringVar(&statusFilter, "status", ".*",
 		"If provided, output is filtered to only nodes matching the regular "+
 			"expression for status.")
-	f.StringVar(&segment, "segment", "",
+	f.StringVar(&segment, "segment", consulapi.AllSegments,
 		"(Enterprise-only) If provided, output is filtered to only nodes in"+
 			"the given segment.")
 
diff --git a/website/source/api/agent.html.md b/website/source/api/agent.html.md
index 7cf0ad3aae..1993e1caed 100644
--- a/website/source/api/agent.html.md
+++ b/website/source/api/agent.html.md
@@ -44,9 +44,11 @@ The table below shows this endpoint's support for
   members (which is the default). This is only eligible for agents running in
   **server mode**. This is specified as part of the URL as a query parameter.
 
-- `segment` `(string: "")` - (Enterprise-only) Specifies the segment to list members in. If left blank,
-this will query for the default segment when connecting to a server and the agent's
-own segment when connecting to a client (clients can only be part of one network segment).
+- `segment` `(string: "")` - (Enterprise-only) Specifies the segment to list members for.
+  If left blank, this will query for the default segment when connecting to a server and
+  the agent's own segment when connecting to a client (clients can only be part of one
+  network segment). When querying a server, setting this to the special string `_all`
+  will show members in all segments.
 
 ### Sample Request