diff --git a/deluge/plugins/blocklist/blocklist/readers.py b/deluge/plugins/blocklist/blocklist/readers.py
index 89ebd1559..a520fad3c 100644
--- a/deluge/plugins/blocklist/blocklist/readers.py
+++ b/deluge/plugins/blocklist/blocklist/readers.py
@@ -34,6 +34,7 @@
 #
 
 from common import raiseError, remove_zeros
+import re
 
 class ReaderParseError(Exception):
     pass
@@ -69,6 +70,9 @@ class BaseReader(object):
             if not self.is_ignored(line):
                 try:
                     (start, end) = self.parse(line)
+                    if not re.match("^(\d{1,3}\.){4}$", start + ".") or \
+                       not re.match("^(\d{1,3}\.){4}$", end + "."):
+                        valid = False
                 except:
                     valid = False
                 finally:
@@ -94,7 +98,7 @@ class SafePeerReader(BaseReader):
     """Blocklist reader for SafePeer style blocklists"""
     @raiseError(ReaderParseError)
     def parse(self, line):
-        return line.strip().split(":")[1].split("-")
+        return line.strip().split(":")[-1].split("-")
 
 class PeerGuardianReader(SafePeerReader):
     """Blocklist reader for PeerGuardian style blocklists"""