diff --git a/nmap.cc b/nmap.cc
index c5b958603..3dbc022ca 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -354,7 +354,6 @@ static int ip_is_reserved(struct in_addr *ip)
     case 7:         /* used for BGP protocol        */
     case 10:        /* the infamous 10.0.0.0/8      */
     case 23:        /* 023/8 is IANA reserved       */
-    case 31:        /* 031/8 is IANA reserved       */
     case 36:        /* 036/8 is IANA reserved       */
     case 37:        /* 037/8 is IANA reserved       */
     case 39:        /* 039/8 is IANA reserved       */
@@ -362,7 +361,6 @@ static int ip_is_reserved(struct in_addr *ip)
     case 49:        /* 049/8 is IANA reserved       */
     case 55:        /* misc. U.S.A. Armed forces    */
     case 127:       /* 127/8 is reserved for loopback */
-    case 176:       /* 176/8 is IANA reserved       */
     case 177:       /* 177/8 is IANA reserved       */
     case 179:       /* 179/8 is IANA reserved       */
     case 181:       /* 181/8 is IANA reserved       */