diff --git a/src/netaddress.cpp b/src/netaddress.cpp
--- a/src/netaddress.cpp
+++ b/src/netaddress.cpp
@@ -8,6 +8,7 @@
 #include <hash.h>
 #include <util/asmap.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 
 #include <tinyformat.h>
 
@@ -50,13 +51,6 @@
     m_addr = ipIn.m_addr;
 }
 
-template <typename T1, size_t PREFIX_LEN>
-inline bool HasPrefix(const T1 &obj,
-                      const std::array<uint8_t, PREFIX_LEN> &prefix) {
-    return obj.size() >= PREFIX_LEN &&
-           std::equal(std::begin(prefix), std::end(prefix), std::begin(obj));
-}
-
 void CNetAddr::SetLegacyIPv6(Span<const uint8_t> ipv6) {
     assert(ipv6.size() == ADDR_IPV6_SIZE);
 
diff --git a/src/util/string.h b/src/util/string.h
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -7,6 +7,8 @@
 
 #include <attributes.h>
 
+#include <algorithm>
+#include <array>
 #include <cstring>
 #include <locale>
 #include <sstream>
@@ -71,4 +73,14 @@
     return oss.str();
 }
 
+/**
+ * Check whether a container begins with the given prefix.
+ */
+template <typename T1, size_t PREFIX_LEN>
+NODISCARD inline bool HasPrefix(const T1 &obj,
+                                const std::array<uint8_t, PREFIX_LEN> &prefix) {
+    return obj.size() >= PREFIX_LEN &&
+           std::equal(std::begin(prefix), std::end(prefix), std::begin(obj));
+}
+
 #endif // BITCOIN_UTIL_STRING_H