diff --git a/include/public/net.h b/include/public/net.h
new file mode 100644
index 0000000..4ef21bc
--- /dev/null
+++ b/include/public/net.h
@@ -0,0 +1,33 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#pragma once
+
+#include <stdint.h>
+
+#include "str.h"
+
+enum {
+  TLSL_L3PROTO_IPV4,
+  TLSL_L3PROTO_IPV6,
+};
+
+struct tlsl_ipv4_addr {
+  uint32_t addr;
+};
+
+struct tlsl_ipv6_addr {
+  uint8_t addr[16];
+};
+
+struct tlsl_ip_addr {
+  union {
+    struct tlsl_ipv4_addr v4;
+    struct tlsl_ipv6_addr v6;
+  };
+  uint8_t l3proto;
+};
+
+int tlsl_ip_addr_parse(const char *s, struct tlsl_ip_addr *out);
+str_buf_t tlsl_ip_addr_fmt(const struct tlsl_ip_addr *a);
diff --git a/meson.build b/meson.build
index dcbcc82..651d4b6 100644
--- a/meson.build
+++ b/meson.build
@@ -36,9 +36,10 @@ eventloop_info = {
 }[platform_info['eventloop']]
 
 sources = [
-  'src/str.c',
-  'src/eventloop.c',
   'src/array_list.c',
+  'src/eventloop.c',
+  'src/net.c',
+  'src/str.c',
   eventloop_info['path'],
 ]
 
diff --git a/src/net.c b/src/net.c
new file mode 100644
index 0000000..6d00560
--- /dev/null
+++ b/src/net.c
@@ -0,0 +1,41 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+#include <errno.h>
+#include <arpa/inet.h>
+
+#include "export.h"
+#include "public/net.h"
+
+EXPORT int tlsl_ip_addr_parse(const char *s, struct tlsl_ip_addr *out) {
+  if (inet_pton(AF_INET, s, &out->v4) == 1) {
+    out->l3proto = TLSL_L3PROTO_IPV4;
+    return 0;
+  }
+  if (inet_pton(AF_INET6, s, &out->v6) == 1) {
+    out->l3proto = TLSL_L3PROTO_IPV6;
+    return 0;
+  }
+  return 1;
+}
+
+EXPORT str_buf_t tlsl_ip_addr_fmt(const struct tlsl_ip_addr *a) {
+  char buf[INET6_ADDRSTRLEN] = { 0 };
+  const char *res;
+
+  switch (a->l3proto) {
+  case TLSL_L3PROTO_IPV4:
+    res = inet_ntop(AF_INET, &a->v4, buf, sizeof(buf));
+    break;
+  case TLSL_L3PROTO_IPV6:
+    res = inet_ntop(AF_INET6, &a->v6, buf, sizeof(buf));
+    break;
+  default:
+    errno = EINVAL;
+    return SBUF_NULL;
+  }
+  if (!res)
+    return SBUF_NULL;
+  return sbuf_from_sview(sview_from_cstr_unbounded(buf));
+}