diff --git a/src/SNMP.cpp b/src/SNMP.cpp
index 93c3596b04..ce2769f103 100644
--- a/src/SNMP.cpp
+++ b/src/SNMP.cpp
@@ -124,8 +124,7 @@ void SNMP::handle_async_response(struct snmp_pdu *pdu, const char *agent_ip) {
     } break;
 
     case ASN_OCTET_STR: {
-      // ntop->getTrace()->traceEvent(TRACE_WARNING, "%s = %s", rsp_oid,
-      // vp->val.string);
+      // ntop->getTrace()->traceEvent(TRACE_WARNING, "%s = %s", rsp_oid, vp->val.string);
       char buf[512];
       bool is_printable = true;
       u_int i, len = min(sizeof(buf) - 1, vp->val_len);
@@ -133,6 +132,7 @@ void SNMP::handle_async_response(struct snmp_pdu *pdu, const char *agent_ip) {
       for (i = 0; i < len; i++) {
 	if((!isprint(vp->val.string[i]))
 	   && (!isspace(vp->val.string[i]))
+	   && (!ispunct(vp->val.string[i]))
 	   // && (vp->val.string[i] < 191) /* Windows-1252 */
 	   ) {
 	  is_printable = false;
diff --git a/third-party/snmp/asn1.c b/third-party/snmp/asn1.c
index 2e1ef68b35..26c7ee9db3 100644
--- a/third-party/snmp/asn1.c
+++ b/third-party/snmp/asn1.c
@@ -592,7 +592,11 @@ int asn1_parse_string_type(ASN1Parser *parser, int *type, char **dest)
     /* Check for IPv4 addresses */
     u_int8_t v1 = (*dest)[0] & 0xFF, v2 = (*dest)[1] & 0xFF, v3 = (*dest)[2] & 0xFF, v4 = (*dest)[3] & 0xFF;
 
-    if(isalnum(v1) && isalnum(v2) && isalnum(v3) && isalnum(v4))
+    if((isalnum(v1)    || ispunct(v1))
+       && (isalnum(v2) || ispunct(v2))
+       && (isalnum(v3) || ispunct(v3))
+       && (isalnum(v4) || ispunct(v4))
+      )
       /* this looks like a string */;
     else {
       char tmp[24];