diff --git a/sys/include/net/gnrc/sixlowpan/frag/rb.h b/sys/include/net/gnrc/sixlowpan/frag/rb.h
index ff5dfb8259..8bfa78c84d 100644
--- a/sys/include/net/gnrc/sixlowpan/frag/rb.h
+++ b/sys/include/net/gnrc/sixlowpan/frag/rb.h
@@ -251,6 +251,27 @@ static inline void gnrc_sixlowpan_frag_rb_remove(gnrc_sixlowpan_frag_rb_t *rbuf)
 }
 #endif
 
+#if defined(TEST_SUITES) || defined(DOXYGEN)
+/**
+ * @brief   Check if pool of fragment intervals is empty
+ *
+ * @see     @ref gnrc_sixlowpan_frag_rb_int_t
+ * @note    Returns only non-true values if @ref TEST_SUITES is defined.
+ *
+ * @return  true, if pool of fragment intervals is empty
+ * @return  false, if pool of fragment intervals is not empty
+ */
+bool gnrc_sixlowpan_frag_rb_ints_empty(void);
+#else   /* defined(TEST_SUITES) || defined(DOXYGEN) */
+/* always true without TEST_SUITES defined to optimize out when not testing,
+ * as checking the status of the fragment interval pool is unnecessary in
+ * production */
+static inline bool gnrc_sixlowpan_frag_rb_ints_empty(void)
+{
+    return true;
+}
+#endif  /* defined(TEST_SUITES) || defined(DOXYGEN) */
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c b/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c
index fee17cc9e3..dedd6cec6a 100644
--- a/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c
+++ b/sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c
@@ -423,6 +423,18 @@ static gnrc_sixlowpan_frag_rb_int_t *_rbuf_int_get_free(void)
     return NULL;
 }
 
+#ifdef TEST_SUITES
+bool gnrc_sixlowpan_frag_rb_ints_empty(void)
+{
+    for (unsigned int i = 0; i < RBUF_INT_SIZE; i++) {
+        if (rbuf_int[i].end > 0) {
+            return false;
+        }
+    }
+    return true;
+}
+#endif  /* TEST_SUITES */
+
 static bool _rbuf_update_ints(gnrc_sixlowpan_frag_rb_base_t *entry,
                               uint16_t offset, size_t frag_size)
 {