diff --git a/hbd b/hbd
index ca3bb39..16c8871 100755
--- a/hbd
+++ b/hbd
@@ -253,10 +253,10 @@ def pushmattermost(msg):
 	
 # nsupdate:  set the DNS A record for a fqdn
 #	return: None if ok, else error text
-def nsupdate(hostname, newip):
+def nsupdate(hostname, newip, dyndomain):
 	D = {}
 	D['domain'] = dyndomain
-	D['fqdn'] = dynfqdn % hostname
+	D['fqdn'] = "%s.dy.%s" % (hostname, dyndomain)
 	D['dnsttl'] = '5'
 	D['newip'] = newip
 	D['ts'] = time.strftime('%Y-%m-%d.%H:%M:%S', time.gmtime())
@@ -280,7 +280,7 @@ answer
 """ % D
 
 	if DEBUG > 0: log(None, "DBG: nsup %s" % nsup)
-	cmd = [nsupdate_bin, "-k", "/etc/dhcpc/K%(domain)s.+157+00000." % D, "-v"]
+	cmd = [nsupdate_bin, "-k", "/etc/dhcpc/Kdy.%(domain)s.+157+00000." % D, "-v"]
 	if DEBUG > 0: log(None, "DBG: cmd %s" % cmd)
 	try:
 		p = Popen(cmd, shell=False, bufsize=1, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
@@ -389,12 +389,13 @@ def dnsupdatethread():
 	while True:
 		name, addr = hbdclass.Host.dnsQ.get()
 		m = "changed address to %s" % (addr)
-		err = nsupdate(name, addr)
-		if err:
-			m += ", DNS update failed: %s" % err
-			email("error: nsupdate failed", "%s: %s" % (name, m))
-		else:
-			m += ", DNS updated."
+		for dyndomain in dyndomains:
+			err = nsupdate(name, addr, dyndomain)
+			if err:
+				m += ", DNS update failed: %s" % err
+				email("error: nsupdate failed", "%s.dy.%s: %s" % (name, dyndomain, m))
+			else:
+				m += ", DNS updated."
 		hbdclass.Host.dnsQ.task_done()
 		log(name, m)