diff --git a/src/modules/module-netjack2-driver.c b/src/modules/module-netjack2-driver.c
index dab6a51e2..adf29d3aa 100644
--- a/src/modules/module-netjack2-driver.c
+++ b/src/modules/module-netjack2-driver.c
@@ -731,19 +731,6 @@ on_data_io(void *data, int fd, uint32_t mask)
 	}
 }
 
-static bool is_multicast(struct sockaddr *sa, socklen_t salen)
-{
-	if (sa->sa_family == AF_INET) {
-		static const uint32_t ipv4_mcast_mask = 0xe0000000;
-		struct sockaddr_in *sa4 = (struct sockaddr_in*)sa;
-		return (ntohl(sa4->sin_addr.s_addr) & ipv4_mcast_mask) == ipv4_mcast_mask;
-	} else if (sa->sa_family == AF_INET6) {
-		struct sockaddr_in6 *sa6 = (struct sockaddr_in6*)sa;
-		return sa6->sin6_addr.s6_addr[0] == 0xff;
-	}
-	return false;
-}
-
 static int make_socket(struct sockaddr_storage *src, socklen_t src_len,
 		struct sockaddr_storage *dst, socklen_t dst_len,
 		bool loop, int ttl, int dscp, const char *ifname)
@@ -789,7 +776,7 @@ static int make_socket(struct sockaddr_storage *src, socklen_t src_len,
 		pw_log_error("bind() failed: %m");
 		goto error;
 	}
-	if (is_multicast((struct sockaddr*)dst, dst_len)) {
+	if (pw_net_is_multicast(dst)) {
 		val = loop;
 		if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &val, sizeof(val)) < 0)
 			pw_log_warn("setsockopt(IP_MULTICAST_LOOP) failed: %m");
diff --git a/src/modules/module-netjack2-manager.c b/src/modules/module-netjack2-manager.c
index 2d8608c5e..6df2c6577 100644
--- a/src/modules/module-netjack2-manager.c
+++ b/src/modules/module-netjack2-manager.c
@@ -810,19 +810,6 @@ static int create_filters(struct follower *follower)
 	return res;
 }
 
-static bool is_multicast(struct sockaddr *sa, socklen_t salen)
-{
-	if (sa->sa_family == AF_INET) {
-		static const uint32_t ipv4_mcast_mask = 0xe0000000;
-		struct sockaddr_in *sa4 = (struct sockaddr_in*)sa;
-		return (ntohl(sa4->sin_addr.s_addr) & ipv4_mcast_mask) == ipv4_mcast_mask;
-	} else if (sa->sa_family == AF_INET6) {
-		struct sockaddr_in6 *sa6 = (struct sockaddr_in6*)sa;
-		return sa6->sin6_addr.s6_addr[0] == 0xff;
-	}
-	return false;
-}
-
 static int make_data_socket(struct sockaddr_storage *sa, socklen_t salen,
 		bool loop, int ttl, int dscp, const char *ifname)
 {
@@ -857,7 +844,7 @@ static int make_data_socket(struct sockaddr_storage *sa, socklen_t salen,
 		if (setsockopt(fd, IPPROTO_IP, IP_TOS, &val, sizeof(val)) < 0)
 			pw_log_warn("setsockopt(IP_TOS) failed: %m");
 	}
-	if (is_multicast((struct sockaddr*)sa, salen)) {
+	if (pw_net_is_multicast(sa)) {
 		val = loop;
 		if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &val, sizeof(val)) < 0)
 			pw_log_warn("setsockopt(IP_MULTICAST_LOOP) failed: %m");
diff --git a/src/modules/module-rtp-sap.c b/src/modules/module-rtp-sap.c
index 21e387eba..452bc18fc 100644
--- a/src/modules/module-rtp-sap.c
+++ b/src/modules/module-rtp-sap.c
@@ -389,19 +389,6 @@ static void session_free(struct session *sess)
 	free(sess);
 }
 
-static bool is_multicast(struct sockaddr *sa, socklen_t salen)
-{
-	if (sa->sa_family == AF_INET) {
-		static const uint32_t ipv4_mcast_mask = 0xe0000000;
-		struct sockaddr_in *sa4 = (struct sockaddr_in*)sa;
-		return (ntohl(sa4->sin_addr.s_addr) & ipv4_mcast_mask) == ipv4_mcast_mask;
-	} else if (sa->sa_family == AF_INET6) {
-		struct sockaddr_in6 *sa6 = (struct sockaddr_in6*)sa;
-		return sa6->sin6_addr.s6_addr[0] == 0xff;
-	}
-	return false;
-}
-
 static int make_unix_ptp_mgmt_socket(const char *path) {
 	struct sockaddr_un addr;
 
@@ -451,7 +438,7 @@ static int make_send_socket(
 		pw_log_error("connect() failed: %m");
 		goto error;
 	}
-	if (is_multicast((struct sockaddr*)sa, salen)) {
+	if (pw_net_is_multicast(sa)) {
 		if (sa->ss_family == AF_INET) {
 			val = loop;
 			if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &val, sizeof(val)) < 0)
@@ -762,7 +749,7 @@ static int make_sdp(struct impl *impl, struct session *sess, char *buffer, size_
 	if ((user_name = pw_get_user_name()) == NULL)
 		user_name = "-";
 
-	multicast = is_multicast((struct sockaddr*)&sdp->dst_addr, sdp->dst_len);
+	multicast = pw_net_is_multicast(&sdp->dst_addr);
 
 	spa_zero(dst_ttl);
 	if (multicast)
@@ -813,7 +800,7 @@ static int make_sdp(struct impl *impl, struct session *sess, char *buffer, size_
 				sdp->payload, sdp->mime_type, sdp->rate);
 	}
 
-	if (is_multicast((struct sockaddr*)&sdp->dst_addr, sdp->dst_len))
+	if (pw_net_is_multicast(&sdp->dst_addr))
 		spa_strbuf_append(&buf,
 			"a=source-filter: incl IN %s %s %s\n", dst_ip4 ? "IP4" : "IP6",
 				dst_addr, src_addr);
diff --git a/src/modules/module-rtp-sink.c b/src/modules/module-rtp-sink.c
index c77fc067a..0edea4e5b 100644
--- a/src/modules/module-rtp-sink.c
+++ b/src/modules/module-rtp-sink.c
@@ -198,19 +198,6 @@ struct impl {
 	int rtp_fd;
 };
 
-static bool is_multicast(struct sockaddr *sa, socklen_t salen)
-{
-	if (sa->sa_family == AF_INET) {
-		static const uint32_t ipv4_mcast_mask = 0xe0000000;
-		struct sockaddr_in *sa4 = (struct sockaddr_in*)sa;
-		return (ntohl(sa4->sin_addr.s_addr) & ipv4_mcast_mask) == ipv4_mcast_mask;
-	} else if (sa->sa_family == AF_INET6) {
-		struct sockaddr_in6 *sa6 = (struct sockaddr_in6*)sa;
-		return sa6->sin6_addr.s6_addr[0] == 0xff;
-	}
-	return false;
-}
-
 static int make_socket(struct sockaddr_storage *src, socklen_t src_len,
 		struct sockaddr_storage *dst, socklen_t dst_len,
 		bool loop, int ttl, int dscp, char *ifname)
@@ -239,7 +226,7 @@ static int make_socket(struct sockaddr_storage *src, socklen_t src_len,
 		pw_log_error("connect() failed: %m");
 		goto error;
 	}
-	if (is_multicast((struct sockaddr*)dst, dst_len)) {
+	if (pw_net_is_multicast(dst)) {
 		if (dst->ss_family == AF_INET) {
 			val = loop;
 			if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &val, sizeof(val)) < 0)
diff --git a/src/modules/module-vban-send.c b/src/modules/module-vban-send.c
index a3ea7c760..e54f41998 100644
--- a/src/modules/module-vban-send.c
+++ b/src/modules/module-vban-send.c
@@ -223,19 +223,6 @@ static const struct vban_stream_events stream_events = {
 	.send_packet = stream_send_packet,
 };
 
-static bool is_multicast(struct sockaddr *sa, socklen_t salen)
-{
-	if (sa->sa_family == AF_INET) {
-		static const uint32_t ipv4_mcast_mask = 0xe0000000;
-		struct sockaddr_in *sa4 = (struct sockaddr_in*)sa;
-		return (ntohl(sa4->sin_addr.s_addr) & ipv4_mcast_mask) == ipv4_mcast_mask;
-	} else if (sa->sa_family == AF_INET6) {
-		struct sockaddr_in6 *sa6 = (struct sockaddr_in6*)sa;
-		return sa6->sin6_addr.s6_addr[0] == 0xff;
-	}
-	return false;
-}
-
 static int make_socket(struct sockaddr_storage *src, socklen_t src_len,
 		struct sockaddr_storage *dst, socklen_t dst_len,
 		bool loop, int ttl, int dscp)
@@ -257,7 +244,7 @@ static int make_socket(struct sockaddr_storage *src, socklen_t src_len,
 		pw_log_error("connect() failed: %m");
 		goto error;
 	}
-	if (is_multicast((struct sockaddr*)dst, dst_len)) {
+	if (pw_net_is_multicast(dst)) {
 		val = loop;
 		if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &val, sizeof(val)) < 0)
 			pw_log_warn("setsockopt(IP_MULTICAST_LOOP) failed: %m");
diff --git a/src/modules/network-utils.h b/src/modules/network-utils.h
index 8a8546461..ca7aa541d 100644
--- a/src/modules/network-utils.h
+++ b/src/modules/network-utils.h
@@ -196,6 +196,19 @@ static inline bool pw_net_addr_is_any(struct sockaddr_storage *addr)
 	return false;
 }
 
+static inline bool pw_net_is_multicast(struct sockaddr_storage *addr)
+{
+	if (addr->ss_family == AF_INET) {
+		static const uint32_t ipv4_mcast_mask = 0xe0000000;
+		struct sockaddr_in *sa4 = (struct sockaddr_in*)addr;
+		return (ntohl(sa4->sin_addr.s_addr) & ipv4_mcast_mask) == ipv4_mcast_mask;
+	} else if (addr->ss_family == AF_INET6) {
+		struct sockaddr_in6 *sa6 = (struct sockaddr_in6*)addr;
+		return sa6->sin6_addr.s6_addr[0] == 0xff;
+	}
+	return false;
+}
+
 #ifndef LISTEN_FDS_START
 #define LISTEN_FDS_START 3
 #endif