diff --git a/irrd/rpsl/fields.py b/irrd/rpsl/fields.py
index da0039c..5e74869 100644
--- a/irrd/rpsl/fields.py
+++ b/irrd/rpsl/fields.py
@@ -218,6 +218,10 @@ def parse(
         value = value.replace(",", "")  # #311, process multiline PK correctly
         if "-" in value:
             ip1_input, ip2_input = value.split("-", 1)
+        elif "/" in value:
+            ip = IP(value, ipversion=4)
+            ip1_input = ip.net()
+            ip2_input = ip.broadcast()
         else:
             ip1_input = ip2_input = value
 
@@ -236,7 +240,7 @@ def parse(
             messages.error(f"Invalid address range: {value}: first IP is higher than second IP")
             return None
 
-        if "-" in value:
+        if "-" in value or "/" in value:
             parsed_value = f"{ip1} - {ip2}"
         else:
             parsed_value = str(ip1)