diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 0966683..c1055f1 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1043,6 +1043,93 @@
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_SHA256_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_RSA_C
 x509_verify:"data_files/server5-tricky-ip-san.crt":"data_files/server5-tricky-ip-san.crt":"data_files/crl_sha256.pem":"6162\:6364\:\:6F6D":MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:MBEDTLS_X509_BADCERT_CN_MISMATCH:"":"NULL"
 
+X509 CRT parse CN: IPv4 valid address
+x509_crt_parse_cn_inet_pton:"10.10.10.10":"0A0A0A0A":4
+
+X509 CRT parse CN: IPv4 excess 0s
+x509_crt_parse_cn_inet_pton:"10.0000.10.10":"":0
+
+X509 CRT parse CN: IPv4 short address
+x509_crt_parse_cn_inet_pton:"10.10.10":"":0
+
+X509 CRT parse CN: IPv4 invalid ? char
+x509_crt_parse_cn_inet_pton:"10.10?10.10":"":0
+
+X509 CRT parse CN: IPv4 invalid - char
+x509_crt_parse_cn_inet_pton:"10.-10.10.10":"":0
+
+X509 CRT parse CN: IPv4 invalid + char
+x509_crt_parse_cn_inet_pton:"10.+10.10.10":"":0
+
+X509 CRT parse CN: IPv4 begin dot
+x509_crt_parse_cn_inet_pton:".10.10.10.10":"":0
+
+X509 CRT parse CN: IPv4 end dot
+x509_crt_parse_cn_inet_pton:"10.10.10.10.":"":0
+
+X509 CRT parse CN: IPv4 consecutive dots
+x509_crt_parse_cn_inet_pton:"10.10..10.10.":"":0
+
+X509 CRT parse CN: IPv4 overlarge octet 256
+x509_crt_parse_cn_inet_pton:"10.256.10.10":"":0
+
+X509 CRT parse CN: IPv4 overlarge octet 1000
+x509_crt_parse_cn_inet_pton:"10.1000.10.10":"":0
+
+X509 CRT parse CN: IPv4 additional octet
+x509_crt_parse_cn_inet_pton:"10.10.10.10.10":"":0
+
+X509 CRT parse CN: IPv6 valid address
+x509_crt_parse_cn_inet_pton:"1\:2\:3\:4\:5\:6\:7\:8":"00010002000300040005000600070008":16
+
+X509 CRT parse CN: IPv6 valid address shorthand
+x509_crt_parse_cn_inet_pton:"6263\:\:1":"62630000000000000000000000000001":16
+
+X509 CRT parse CN: IPv6 valid address shorthand start
+x509_crt_parse_cn_inet_pton:"\:\:1":"00000000000000000000000000000001":16
+
+X509 CRT parse CN: IPv6 valid address extra 0s
+x509_crt_parse_cn_inet_pton:"0001\:\:0001\:0001":"00010000000000000000000000010001":16
+
+X509 CRT parse CN: IPv6 invalid address excess 0s
+x509_crt_parse_cn_inet_pton:"1\:00000\:1\:0":"":0
+
+X509 CRT parse CN: IPv6 invalid address - start single colon
+x509_crt_parse_cn_inet_pton:"\:6263\:\:1":"":0
+
+X509 CRT parse CN: IPv6 invalid address - end single colon
+x509_crt_parse_cn_inet_pton:"6263\:\:1\:":"":0
+
+X509 CRT parse CN: IPv6 short address
+x509_crt_parse_cn_inet_pton:"1\:1\:1":"":0
+
+X509 CRT parse CN: IPv6 wildcard address
+x509_crt_parse_cn_inet_pton:"\:\:":"00000000000000000000000000000000":16
+
+X509 CRT parse CN: IPv6 address too long
+x509_crt_parse_cn_inet_pton:"1\:2\:3\:4\:5\:6\:7\:8\:9":"":0
+
+X509 CRT parse CN: IPv6 long hextet
+x509_crt_parse_cn_inet_pton:"12345\:\:1":"":0
+
+X509 CRT parse CN: IPv6 invalid char
+x509_crt_parse_cn_inet_pton:"\:\:\:1":"":0
+
+X509 CRT parse CN: IPv6 invalid - char
+x509_crt_parse_cn_inet_pton:"\:\:-1\:1":"":0
+
+X509 CRT parse CN: IPv6 invalid + char
+x509_crt_parse_cn_inet_pton:"\:\:+1\:1":"":0
+
+X509 CRT parse CN: IPv6 valid address IPv4-mapped
+x509_crt_parse_cn_inet_pton:"\:\:ffff\:1.2.3.4":"00000000000000000000ffff01020304":16
+
+X509 CRT parse CN: IPv6 invalid address IPv4-mapped #1
+x509_crt_parse_cn_inet_pton:"\:\:ffff\:999.2.3.4":"":0
+
+X509 CRT parse CN: IPv6 invalid address IPv4-mapped #2
+x509_crt_parse_cn_inet_pton:"\:\:1.2.3.4\:ffff":"":0
+
 X509 CRT verification with ca callback: failure
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_MD_CAN_SHA1:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK
 x509_verify_ca_cb_failure:"data_files/server1.crt":"data_files/test-ca.crt":"NULL":MBEDTLS_ERR_X509_FATAL_ERROR
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 177bc97..905d62f 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -11,6 +11,8 @@
 #include "mbedtls/pk.h"
 #include "string.h"
 
+#include "x509_invasive.h"
+
 #if MBEDTLS_X509_MAX_INTERMEDIATE_CA > 19
 #error "The value of MBEDTLS_X509_MAX_INTERMEDIATE_C is larger \
     than the current threshold 19. To test larger values, please \
@@ -436,6 +438,19 @@
 }
 /* END_CASE */
 
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_TEST_HOOKS */
+void x509_crt_parse_cn_inet_pton(const char *cn, data_t *exp, int ref_ret)
+{
+    uint32_t addr[4];
+    size_t addrlen = mbedtls_x509_crt_parse_cn_inet_pton(cn, addr);
+    TEST_EQUAL(addrlen, (size_t) ref_ret);
+
+    if (addrlen) {
+        ASSERT_COMPARE(exp->x, exp->len, addr, addrlen);
+    }
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
 void x509_parse_san(char *crt_file, char *result_str, int parse_result)
 {