diff --git a/main.go b/main.go
index b1bc9e8..ae8a8a0 100644
--- a/main.go
+++ b/main.go
@@ -145,9 +145,9 @@ func handleRange(w http.ResponseWriter, r *http.Request) {
 					O3 = octets[2]
 				}
 				if len(octets[3]) < 2 {
-					O3 = "0" + octets[3]
+					O4 = "0" + octets[3]
 				} else {
-					O3 = octets[3]
+					O4 = octets[3]
 				}
 				N := "PC" + O3 + O4
 				d.Rows = append(d.Rows, addrPair{IPv4: b.IPv4, IPv6: b.IPv6, Name: N})