diff --git a/deployment/configs/config.json b/deployment/configs/config.json
index de6db85a..38c0ead5 100755
--- a/deployment/configs/config.json
+++ b/deployment/configs/config.json
@@ -75,7 +75,8 @@
         "reporting": false,
         "remediation": false,
         "remediation_accounts": ["210987654321", "654321210987"],
-        "remediation_retention_period": 21
+        "remediation_retention_period": 21,
+        "known_ip_sources": ["205.203.150.72", "205.203.130.22"]
     },
     "user_inactivekeys": {
         "enabled": true,
diff --git a/hammer/library/aws/security_groups.py b/hammer/library/aws/security_groups.py
index 814d88aa..bab672d7 100755
--- a/hammer/library/aws/security_groups.py
+++ b/hammer/library/aws/security_groups.py
@@ -8,12 +8,14 @@
 from library.utility import jsonDumps
 from library.aws.s3 import S3Operations
 from library.aws.utility import convert_tags
+from library.config import Config
 
 
 class RestrictionStatus(Enum):
     Restricted = "restricted"
     OpenCompletely = "open_completely"
     OpenPartly = "open_partly"
+    Safe = "safe"
 
 
 class SecurityGroupOperations:
@@ -372,6 +374,28 @@ def __str__(self):
         perms = ", ".join([str(perm) for perm in self.permissions])
         return f"{self.__class__.__name__}(Name={self.name}, Id={self.id}, Permissions=[{perms}])"
 
+    def validate_known_ip_soource(self, source_ip):
+        """
+        
+        :param source_ip: ip address
+        :return: boolean
+        """
+        config = Config()
+        known_ip_sources = config.sg.known_ip_sources
+        source_cidr = ipaddress.ip_network(source_ip)
+
+        for known_ip in known_ip_sources:
+            known_ip_cidr = ipaddress.ip_network(known_ip)
+            if known_ip_cidr == source_cidr:
+                return True
+            elif source_ip.endswith("/32"):
+                if source_cidr[-1] in known_ip_cidr:
+                    return True
+            # ipaddress.subnet_of() function new to Python 3.7. Not available in 3.6
+            """elif source_cidr.subnet_of(known_ip_cidr):
+                return True"""
+        return False
+
     def restriction_status(self, cidr):
         """
         Check restriction status of cidr
@@ -380,11 +404,17 @@ def restriction_status(self, cidr):
 
         :return: RestrictionStatus with check result
         """
+        is_known_ip = self.validate_known_ip_soource(cidr)
+
         status = RestrictionStatus.Restricted
         if cidr.endswith("/0"):
             status = RestrictionStatus.OpenCompletely
         elif ipaddress.ip_network(cidr).is_global:
             status = RestrictionStatus.OpenPartly
+
+        if is_known_ip:
+            status = RestrictionStatus.Safe
+
         logging.debug(f"Checked '{cidr}' - '{status.value}'")
         return status
 
@@ -406,10 +436,11 @@ def check(self, restricted_ports):
                 logging.debug(f"Checking '{perm.protocol}' '{perm.from_port}-{perm.to_port}' ports for {ip_range}")
                 # first condition - CIDR is Global/Public
                 status = self.restriction_status(ip_range.cidr)
-                if status == RestrictionStatus.Restricted:
-                    logging.debug(f"Skipping restricted '{ip_range}'")
+                if status in (RestrictionStatus.Restricted, RestrictionStatus.Safe):
+                    logging.debug(f"Skipping restricted/safe IP address '{ip_range}'")
                     continue
-                # second - check if ports from `restricted_ports` list has intersection with ports from FromPort..ToPort range
+                # second - check if ports from `restricted_ports` list has intersection with ports from FromPort..
+                # ToPort range
                 if perm.from_port is None or perm.to_port is None:
                     logging.debug(f"Marking world-wide open all ports from '{ip_range}'")
                     ip_range.status = status