diff --git a/DIRECTORY.md b/DIRECTORY.md
index 7d3ceee144be..4f862c5beb1d 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -233,6 +233,7 @@
     * [Merge Two Lists](data_structures/linked_list/merge_two_lists.py)
     * [Middle Element Of Linked List](data_structures/linked_list/middle_element_of_linked_list.py)
     * [Print Reverse](data_structures/linked_list/print_reverse.py)
+    * [Reverse K Group](data_structures/linked_list/reverse_k_group.py)
     * [Rotate To The Right](data_structures/linked_list/rotate_to_the_right.py)
     * [Singly Linked List](data_structures/linked_list/singly_linked_list.py)
     * [Skip List](data_structures/linked_list/skip_list.py)
@@ -727,6 +728,7 @@
 ## Other
   * [Activity Selection](other/activity_selection.py)
   * [Alternative List Arrange](other/alternative_list_arrange.py)
+  * [Blacklistipchecker](other/blacklistipchecker.py)
   * [Davisb Putnamb Logemannb Loveland](other/davisb_putnamb_logemannb_loveland.py)
   * [Dijkstra Bankers Algorithm](other/dijkstra_bankers_algorithm.py)
   * [Doomsday](other/doomsday.py)
diff --git a/other/blacklistipchecker.py b/other/blacklistipchecker.py
new file mode 100644
index 000000000000..b871f4c66481
--- /dev/null
+++ b/other/blacklistipchecker.py
@@ -0,0 +1,99 @@
+# This CLI script checks if entered ips are or
+# aren`t blacklisted on different lists
+# You need to get API key on blacklistchecker
+# to make it work (it`s free 30 IPs per month)
+
+import json
+import re
+import sys
+from typing import Any
+
+import requests
+
+api_key = "key_CAMF5HI5t4ZzkmgGkioI1tius"
+
+
+def test_ip(ip: str) -> Any:
+    """
+    This function tests if an IP is blacklisted on different lists.
+    It returns a tuple with the IP and a list of the\
+    blacklists where it was detected.
+    >>> test_ip('8.8.8.8')
+    {'statusCode': 401, 'error': 'Too Many Requests',\
+ 'message': 'You do not have enough credits on your\
+ account. Please upgrade to make another request.'}
+    ('limit exceeded!', [])
+    >>> test_ip('127.0.0.1')
+    {'statusCode': 401, 'error': 'Too Many Requests',\
+ 'message': 'You do not have enough credits on your\
+ account. Please upgrade to make another request.'}
+    ('limit exceeded!', [])
+    """
+    link = f"https://api.blacklistchecker.com/check/{ip}"
+    result = requests.get(link, auth=(api_key, ""))
+    result_dec = json.loads(result.content)
+    print(result_dec)
+    detects: list[str] = []
+    if result_dec.get("statusCode") == 401:
+        res = "limit exceeded!"
+        return (res, detects)
+    elif result_dec.get("detections") != 0:
+        res = ip
+        blsts = result_dec.get("blacklists")
+        for n in blsts:
+            if n.get("detected") is True:
+                detects.append(n.get("name"))
+        return (res, detects)
+
+
+def isip(ip: str) -> bool:
+    """
+    Check if a given string is a valid IP address.
+    >>> isip('192.168.0.1')
+    True
+    >>> isip('10.0.0.256')
+    False
+    >>> isip('127.0.0.1')
+    True
+    >>> isip('google.com')
+    False
+    >>> isip('2001:0db8:85a3:0000:0000:8a2e:0370:7334')
+    False
+    """
+    match = re.match(r"[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}", ip)
+    if not bool(match):
+        return False
+    return all(0 <= int(octet) <= 255 for octet in ip.split("."))
+
+
+res_txt = "IP blacklists check returned next results:\n"
+send_param = 0
+if len(sys.argv) > 1:
+    for x in sys.argv[1:]:
+        if isip(x) is not True:
+            print(f"IP {x} is incorrect\n")
+        else:
+            if test_ip(x) is not None:
+                res, detec = test_ip(x)
+                if res == "limit exceeded":
+                    res_txt = res_txt + " LIMIT Exceeded!"
+                    break
+                else:
+                    res_txt += f"{res} is detected in {detec} blacklists \n \n"
+else:
+    print("Type in ip to check")
+    x = input()
+    if isip(x) is not True:
+        print(f"IP {x} is incorrect\n")
+    else:
+        if test_ip(x) is not None:
+            res, detec = test_ip(x)
+            if res == "limit exceeded":
+                res_txt = res_txt + "Limit Exceeded!\n"
+            else:
+                res_txt += f"{res} is detected in {detec} blacklists \n \n"
+if len(res_txt) <= 43:
+    print("IPs not blacklisted!")
+    print(res_txt)
+else:
+    print("Blacklist check result is: \n" + res_txt)