diff --git a/transporthandler.hpp b/transporthandler.hpp
index 6c58dc5..c2940b4 100644
--- a/transporthandler.hpp
+++ b/transporthandler.hpp
@@ -158,6 +158,12 @@
 constexpr uint8_t MAX_IPV6_STATIC_ADDRESSES = 15;
 constexpr uint8_t MAX_IPV6_DYNAMIC_ADDRESSES = 15;
 
+// Prefix length limits of phosphor-networkd
+constexpr uint8_t MIN_IPV4_PREFIX_LENGTH = 1;
+constexpr uint8_t MAX_IPV4_PREFIX_LENGTH = 32;
+constexpr uint8_t MIN_IPV6_PREFIX_LENGTH = 1;
+constexpr uint8_t MAX_IPV6_PREFIX_LENGTH = 128;
+
 /** @brief The dbus parameters for the interface corresponding to a channel
  *         This helps reduce the number of mapper lookups we need for each
  *         query and simplifies finding the VLAN interface if needed.