diff --git a/cmd/strelaypoolsrv/main.go b/cmd/strelaypoolsrv/main.go
index 6b84f434..5bcdd327 100644
--- a/cmd/strelaypoolsrv/main.go
+++ b/cmd/strelaypoolsrv/main.go
@@ -25,6 +25,7 @@ import (
 
 type relay struct {
 	URL string `json:"url"`
+	uri *url.URL
 }
 
 func (r relay) String() string {
@@ -80,7 +81,7 @@ func main() {
 
 	if dir != "" {
 		if debug {
-			log.Println("Starting TLS listener")
+			log.Println("Starting TLS listener on", listen)
 		}
 		certFile, keyFile := filepath.Join(dir, "http-cert.pem"), filepath.Join(dir, "http-key.pem")
 		cert, err := tls.LoadX509KeyPair(certFile, keyFile)
@@ -109,7 +110,7 @@ func main() {
 		listener, err = tls.Listen("tcp", listen, tlsCfg)
 	} else {
 		if debug {
-			log.Println("Starting plain listener")
+			log.Println("Starting plain listener on", listen)
 		}
 		listener, err = net.Listen("tcp", listen)
 	}
@@ -176,16 +177,6 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	for _, current := range permanentRelays {
-		if current == newRelay {
-			if debug {
-				log.Println("Asked to add a relay", newRelay, "which exists in permanent list")
-			}
-			http.Error(w, "Invalid request", 500)
-			return
-		}
-	}
-
 	uri, err := url.Parse(newRelay.URL)
 	if err != nil {
 		if debug {
@@ -195,6 +186,40 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	host, port, err := net.SplitHostPort(uri.Host)
+	if err != nil {
+		if debug {
+			log.Println("Failed to split URI", newRelay.URL)
+		}
+		http.Error(w, err.Error(), 500)
+		return
+	}
+
+	// The client did not provide an IP address, work it out.
+	if host == "" {
+		rhost, _, err := net.SplitHostPort(r.RemoteAddr)
+		if err != nil {
+			if debug {
+				log.Println("Failed to split remote address", r.RemoteAddr)
+			}
+			http.Error(w, err.Error(), 500)
+			return
+		}
+		uri.Host = net.JoinHostPort(rhost, port)
+		newRelay.URL = uri.String()
+	}
+	newRelay.uri = uri
+
+	for _, current := range permanentRelays {
+		if current.uri.Host == newRelay.uri.Host {
+			if debug {
+				log.Println("Asked to add a relay", newRelay, "which exists in permanent list")
+			}
+			http.Error(w, "Invalid request", 500)
+			return
+		}
+	}
+
 	reschan := make(chan result)
 
 	select {
@@ -233,8 +258,18 @@ func loadPermanentRelays() {
 		if len(line) == 0 {
 			continue
 		}
+
+		uri, err := url.Parse(line)
+		if err != nil {
+			if debug {
+				log.Println("Skipping permanent relay", line, "due to parse error", err)
+			}
+			continue
+		}
+
 		permanentRelays = append(permanentRelays, relay{
 			URL: line,
+			uri: uri,
 		})
 		if debug {
 			log.Println("Adding permanent relay", line)
@@ -271,7 +306,7 @@ func requestProcessor() {
 		}
 
 		mut.Lock()
-		timer, ok := evictionTimers[request.relay.URL]
+		timer, ok := evictionTimers[request.relay.uri.Host]
 		if ok {
 			if debug {
 				log.Println("Stopping existing timer for", request.relay)
@@ -280,7 +315,7 @@ func requestProcessor() {
 		}
 
 		for _, current := range knownRelays {
-			if current == request.relay {
+			if current.uri.Host == request.relay.uri.Host {
 				if debug {
 					log.Println("Relay", request.relay, "already exists")
 				}
@@ -294,7 +329,7 @@ func requestProcessor() {
 		knownRelays = append(knownRelays, request.relay)
 
 	found:
-		evictionTimers[request.relay.URL] = time.AfterFunc(evictionTime, evict(request.relay))
+		evictionTimers[request.relay.uri.Host] = time.AfterFunc(evictionTime, evict(request.relay))
 		mut.Unlock()
 		request.result <- result{nil, evictionTime}
 	}
@@ -309,7 +344,7 @@ func evict(relay relay) func() {
 			log.Println("Evicting", relay)
 		}
 		for i, current := range knownRelays {
-			if current == relay {
+			if current.uri.Host == relay.uri.Host {
 				if debug {
 					log.Println("Evicted", relay)
 				}
@@ -318,6 +353,6 @@ func evict(relay relay) func() {
 				knownRelays = knownRelays[:last]
 			}
 		}
-		delete(evictionTimers, relay.URL)
+		delete(evictionTimers, relay.uri.Host)
 	}
 }