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diff --git a/zenmap/radialnet/util/misc.py b/zenmap/radialnet/util/misc.py
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+++ b/zenmap/radialnet/util/misc.py
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+# vim: set fileencoding=utf-8 :
+
+# ***********************IMPORTANT NMAP LICENSE TERMS************************
+# *
+# * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
+# * Project"). Nmap is also a registered trademark of the Nmap Project.
+# *
+# * This program is distributed under the terms of the Nmap Public Source
+# * License (NPSL). The exact license text applying to a particular Nmap
+# * release or source code control revision is contained in the LICENSE
+# * file distributed with that version of Nmap or source code control
+# * revision. More Nmap copyright/legal information is available from
+# * https://nmap.org/book/man-legal.html, and further information on the
+# * NPSL license itself can be found at https://nmap.org/npsl/ . This
+# * header summarizes some key points from the Nmap license, but is no
+# * substitute for the actual license text.
+# *
+# * Nmap is generally free for end users to download and use themselves,
+# * including commercial use. It is available from https://nmap.org.
+# *
+# * The Nmap license generally prohibits companies from using and
+# * redistributing Nmap in commercial products, but we sell a special Nmap
+# * OEM Edition with a more permissive license and special features for
+# * this purpose. See https://nmap.org/oem/
+# *
+# * If you have received a written Nmap license agreement or contract
+# * stating terms other than these (such as an Nmap OEM license), you may
+# * choose to use and redistribute Nmap under those terms instead.
+# *
+# * The official Nmap Windows builds include the Npcap software
+# * (https://npcap.com) for packet capture and transmission. It is under
+# * separate license terms which forbid redistribution without special
+# * permission. So the official Nmap Windows builds may not be redistributed
+# * without special permission (such as an Nmap OEM license).
+# *
+# * Source is provided to this software because we believe users have a
+# * right to know exactly what a program is going to do before they run it.
+# * This also allows you to audit the software for security holes.
+# *
+# * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+# * new features. You are highly encouraged to submit your changes as a Github PR
+# * or by email to the dev@nmap.org mailing list for possible incorporation into
+# * the main distribution. Unless you specify otherwise, it is understood that
+# * you are offering us very broad rights to use your submissions as described in
+# * the Nmap Public Source License Contributor Agreement. This is important
+# * because we fund the project by selling licenses with various terms, and also
+# * because the inability to relicense code has caused devastating problems for
+# * other Free Software projects (such as KDE and NASM).
+# *
+# * The free version of Nmap is distributed in the hope that it will be
+# * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
+# * indemnification and commercial support are all available through the
+# * Npcap OEM program--see https://nmap.org/oem/
+# *
+# ***************************************************************************/
+
+from radialnet.core.Coordinate import CartesianCoordinate
+from radialnet.util.geometry import normalize_angle
+import math
+
+
+def ipv4_compare(ip1, ip2):
+    """
+    """
+    ip1 = [int(i) for i in ip1.split('.')]
+    ip2 = [int(i) for i in ip2.split('.')]
+
+    for i in range(4):
+
+        if ip1[i] != ip2[i]:
+
+            if ip1[i] < ip2[i]:
+                return -1
+
+            else:
+                return 1
+
+    return 0
+
+
+def swap(list, a, b):
+    """
+    """
+    list[a], list[b] = list[b], list[a]
+
+
+def sort_children(children, father):
+    """
+    """
+    if len(children) < 2:
+        return children
+
+    # create angle reference
+    f_x, f_y = father.get_cartesian_coordinate()
+
+    for child in children:
+
+        c_x, c_y = child.get_cartesian_coordinate()
+        _, angle = CartesianCoordinate(c_x - f_x, c_y - f_y).to_polar()
+
+        child.set_draw_info({'angle_from_father': math.degrees(angle)})
+
+    return sort_children_by_angle(children)
+
+
+def sort_children_by_angle(children):
+    """
+    """
+
+    vector = list(children)
+    vector.sort(
+            key=lambda c: normalize_angle(
+                c.get_draw_info('angle_from_father')))
+    return vector