diff --git a/includes/icmp.h b/includes/icmp.h
index a193dcf..4b7535f 100644
--- a/includes/icmp.h
+++ b/includes/icmp.h
@@ -44,6 +44,10 @@ int icmp_send_echo(icmp_handle_t *h, struct in_addr dest, uint16_t id,
 int icmp_process(icmp_handle_t *h, icmp_callback_t cb, void *userdata,
 				size_t max_packets);
 
+/* ID/Sequence helpers */
+int icmp_reply_id_seq(const icmp_reply_t *reply, uint16_t *id,
+						uint16_t *seq);
+
 /* Error handling */
 const char *icmp_strerror(const icmp_handle_t *h);
 int icmp_should_retry(const icmp_handle_t *h);
diff --git a/sources.mk b/sources.mk
index 254a253..77ae9f9 100644
--- a/sources.mk
+++ b/sources.mk
@@ -28,6 +28,7 @@ SRCS += $(SRC_DIR)/recv/core/receive_packet.c
 SRCS += $(SRC_DIR)/recv/core/parse_packet.c
 SRCS += $(SRC_DIR)/recv/core/process_single_packet.c
 SRCS += $(SRC_DIR)/recv/api/process.c
+SRCS += $(SRC_DIR)/recv/api/extract_id_seq.c
 
 TESTS_DIR = tests
 TESTS += $(TESTS_DIR)/utils/test_checksum.c
@@ -50,3 +51,4 @@ TESTS += $(TESTS_DIR)/recv/test_build_reply.c
 TESTS += $(TESTS_DIR)/recv/test_receive_packet.c
 TESTS += $(TESTS_DIR)/recv/test_parse_packet.c
 TESTS += $(TESTS_DIR)/recv/test_process.c
+TESTS += $(TESTS_DIR)/recv/test_extract_id_seq.c
diff --git a/src/recv/api/extract_id_seq.c b/src/recv/api/extract_id_seq.c
new file mode 100644
index 0000000..efeab19
--- /dev/null
+++ b/src/recv/api/extract_id_seq.c
@@ -0,0 +1,27 @@
+#include <netinet/in.h>
+#include "icmp.h"
+#include "icmp_types.h"
+#include "internal/icmp_packet.h"
+
+int
+icmp_reply_id_seq(const icmp_reply_t *reply, uint16_t *id, uint16_t *seq)
+{
+	const struct icmp_header *hdr;
+
+	if (NULL == reply)
+		return -1;
+	if (reply->type != ICMP_TYPE_ECHO_REPLY &&
+			reply->type != ICMP_TYPE_ECHO_REQUEST &&
+			reply->type != ICMP_TYPE_TIMESTAMP_REPLY &&
+			reply->type != ICMP_TYPE_TIMESTAMP_REQUEST)
+		return -1;
+	if (NULL == reply->ip_payload || reply->ip_payload_len < 8)
+		return -1;
+
+	hdr = reply->ip_payload;
+	if (NULL != id)
+		*id = ntohs(hdr->un.echo.id);
+	if (NULL != seq)
+		*seq = ntohs(hdr->un.echo.seq);
+	return 0;
+}
diff --git a/tests/recv/test_extract_id_seq.c b/tests/recv/test_extract_id_seq.c
new file mode 100644
index 0000000..81bb796
--- /dev/null
+++ b/tests/recv/test_extract_id_seq.c
@@ -0,0 +1,139 @@
+#include <criterion/criterion.h>
+#include <string.h>
+#include "icmp.h"
+
+static icmp_reply_t
+make_echo_reply(uint8_t type, uint16_t id, uint16_t seq, uint8_t *buffer)
+{
+	icmp_reply_t reply;
+
+	memset(&reply, 0, sizeof(reply));
+	memset(buffer, 0, 8);
+	reply.type = type;
+	reply.code = 0;
+	buffer[0] = type;
+	buffer[1] = 0;
+	buffer[2] = 0;
+	buffer[3] = 0;
+	buffer[4] = (id >> 8) & 0xFF;
+	buffer[5] = id & 0xFF;
+	buffer[6] = (seq >> 8) & 0xFF;
+	buffer[7] = seq & 0xFF;
+	reply.ip_payload = buffer;
+	reply.ip_payload_len = 8;
+	return reply;
+}
+
+Test(extract_echo, echo_reply_type_0)
+{
+	uint8_t buffer[8];
+	icmp_reply_t reply = make_echo_reply(0, 0x1234, 0x5678, buffer);
+	uint16_t id;
+	uint16_t seq;
+	int ret;
+
+	ret = icmp_reply_id_seq(&reply, &id, &seq);
+	cr_assert_eq(ret, 0);
+	cr_assert_eq(id, 0x1234);
+	cr_assert_eq(seq, 0x5678);
+}
+
+Test(extract_echo, echo_request_type_8)
+{
+	uint8_t buffer[8];
+	icmp_reply_t reply = make_echo_reply(8, 0xABCD, 0xEF01, buffer);
+	uint16_t id;
+	uint16_t seq;
+	int ret;
+
+	ret = icmp_reply_id_seq(&reply, &id, &seq);
+	cr_assert_eq(ret, 0);
+	cr_assert_eq(id, 0xABCD);
+	cr_assert_eq(seq, 0xEF01);
+}
+
+Test(extract_echo, non_echo_type_returns_error)
+{
+	uint8_t buffer[8];
+	icmp_reply_t reply = make_echo_reply(3, 0x1234, 0x5678, buffer);
+	uint16_t id = 0xFFFF;
+	uint16_t seq = 0xFFFF;
+	int ret;
+
+	ret = icmp_reply_id_seq(&reply, &id, &seq);
+	cr_assert_eq(ret, -1);
+	cr_assert_eq(id, 0xFFFF, "id should be unchanged on error");
+	cr_assert_eq(seq, 0xFFFF, "seq should be unchanged on error");
+}
+
+Test(extract_echo, null_reply_returns_error)
+{
+	uint16_t id;
+	uint16_t seq;
+	int ret;
+
+	ret = icmp_reply_id_seq(NULL, &id, &seq);
+	cr_assert_eq(ret, -1);
+}
+
+Test(extract_echo, null_id_allowed)
+{
+	uint8_t buffer[8];
+	icmp_reply_t reply = make_echo_reply(0, 0x1234, 0x5678, buffer);
+	uint16_t seq;
+	int ret;
+
+	ret = icmp_reply_id_seq(&reply, NULL, &seq);
+	cr_assert_eq(ret, 0);
+	cr_assert_eq(seq, 0x5678);
+}
+
+Test(extract_echo, null_seq_allowed)
+{
+	uint8_t buffer[8];
+	icmp_reply_t reply = make_echo_reply(0, 0x1234, 0x5678, buffer);
+	uint16_t id;
+	int ret;
+
+	ret = icmp_reply_id_seq(&reply, &id, NULL);
+	cr_assert_eq(ret, 0);
+	cr_assert_eq(id, 0x1234);
+}
+
+Test(extract_echo, both_null_allowed)
+{
+	uint8_t buffer[8];
+	icmp_reply_t reply = make_echo_reply(0, 0x1234, 0x5678, buffer);
+	int ret;
+
+	ret = icmp_reply_id_seq(&reply, NULL, NULL);
+	cr_assert_eq(ret, 0);
+}
+
+Test(extract_echo, payload_too_short_returns_error)
+{
+	uint8_t buffer[8];
+	icmp_reply_t reply = make_echo_reply(0, 0x1234, 0x5678, buffer);
+	uint16_t id;
+	uint16_t seq;
+	int ret;
+
+	reply.ip_payload_len = 7;
+	ret = icmp_reply_id_seq(&reply, &id, &seq);
+	cr_assert_eq(ret, -1);
+}
+
+Test(extract_echo, null_ip_payload_returns_error)
+{
+	icmp_reply_t reply;
+	uint16_t id;
+	uint16_t seq;
+	int ret;
+
+	memset(&reply, 0, sizeof(reply));
+	reply.type = 0;
+	reply.ip_payload = NULL;
+	reply.ip_payload_len = 8;
+	ret = icmp_reply_id_seq(&reply, &id, &seq);
+	cr_assert_eq(ret, -1);
+}