A Free Lecture-based
Educational Course on IP Addressing and Subnetting
Answers assume Non-RFC 1812
networks (must subtract 2 from the number of Host IDs).
Specify The Correct Default Subnet Mask for the Following
Addresses:
Review: Default
Subnet Masks
Recommended Process
Determine address class of address.
Determine
appropriate default subnet mask.
Default Subnet
Mask
210.23.67.102 255.255.255.0
66.23.148.0 255.0.0.0
158.23.251.33 255.255.0.0
144.23.117.254 255.255.0.0
192.254.23.123 255.255.2550
144.207.78.1 255.255.0.0
63.125.23.211 255.0.0.0
192.25.128.36 255.255.255.0
128.12.254.98 255.255.0.0
134.223.156.89 255.255.0.0
127.0.0.1 255.0.0.0
224.23.108.23 N/A Multicast Address
223.78.27.144 255.255.255.0
77.123.28.167 255.0.0.0
191.249.222.234 255.255.0.0
(c) 1999 - 2001 Charles Botsford
Classroom use requires purchased license, see license agreement.
Determine the Appropriate Custom Subnet Masks:
Review: Subnetting
and Custom Subnet Masks
Recommended Process
Determine address class of
address.
First
determine appropriate default subnet mask.
Second
determine the appropriate custom subnet mask that provides:
Subnets
>= Physical Segments
Host
IDs >= Hosts per Physical Segment
Scenario 1 |
|
|
Required Number of Physical Segments: |
5 |
|
Maximum Number of Hosts/Physical Segment: |
5000 |
|
Network Address: |
152.77.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.224.0 |
|
Number of Subnets Supported: |
6 |
|
Maximum Number of Host IDs per Subnet: |
8190 |
Scenario 2 |
|
|
Required Number of Physical Segments: |
100 |
|
Maximum Number of Hosts/Physical Segment: |
88,000 |
|
Network Address: |
39.0.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.254.0.0 |
|
Number of Subnets Supported: |
126 |
|
Maximum Number of Host IDs per Subnet: |
131,070 |
Scenario 3 |
|
|
Required Number of Physical Segments: |
100 |
|
Maximum Number of Hosts/Physical Segment: |
350 |
|
Network Address: |
177.133.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.254.0 |
|
Number of Subnets Supported: |
126 |
|
Maximum Number of Host IDs per Subnet: |
510 |
Scenario 4 |
|
|
Required Number of Physical Segments: |
4 |
|
Maximum Number of Hosts/Physical Segment: |
1,500,000 |
|
Network Address: |
120.0.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.224.0.0 |
|
Number of Subnets Supported: |
6 |
|
Maximum Number of Host IDs per Subnet: |
2,097,150 |
(c) 1999 - 2001 Charles Botsford
Classroom use requires purchased license, see license agreement.
Scenario 5 |
|
|
Required Number of Physical Segments: |
16 |
|
Maximum Number of Hosts/Physical Segment: |
1,500 |
|
Network Address: |
128.199.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.248.0 |
|
Number of Subnets Supported: |
30 |
|
Maximum Number of Host IDs per Subnet: |
2,046 |
Scenario 6 |
|
|
Required Number of Physical Segments: |
250 |
|
Maximum Number of Hosts/Physical Segment: |
100 |
|
Network Address: |
191.254.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.255.0 |
|
Number of Subnets Supported: |
254 |
|
Maximum Number of Host IDs per Subnet: |
254 |
Scenario 7 |
|
|
Required Number of Physical Segments: |
12 |
|
Maximum Number of Hosts/Physical Segment: |
12 |
|
Network Address: |
216.122.44.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.255.240 |
|
Number of Subnets Supported: |
14 |
|
Maximum Number of Host IDs per Subnet: |
14 |
Scenario 8 |
|
|
Required Number of Physical Segments: |
10 |
|
Maximum Number of Hosts/Physical Segment: |
750,000 |
|
Network Address: |
12.0.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.240.0.0 |
|
Number of Subnets Supported: |
14 |
|
Maximum Number of Host IDs per Subnet: |
1,048,574 |
Scenario 9 |
|
|
Required Number of Physical Segments: |
50 |
|
Maximum Number of Hosts/Physical Segment: |
600 |
|
Network Address: |
134.119.0.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.252.0 |
|
Number of Subnets Supported: |
62 |
|
Maximum Number of Host IDs per Subnet: |
1022 |
Scenario 10 |
|
|
Required Number of Physical Segments: |
5 |
|
Maximum Number of Hosts/Physical Segment: |
25 |
|
Network Address: |
192.177.4.0 |
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.255.224 |
|
Number of Subnets Supported: |
6 |
|
Maximum Number of Host IDs per Subnet: |
30 |
(c) 1999 - 2001 Charles Botsford
Classroom use requires purchased license, see license agreement.
Determine Subnet IDs and Ranges of Host IDs
Review: Subnetting
and Custom Subnet Masks
Recommended Process
Determine address class of
address.
First
determine appropriate default subnet mask.
Second
determine the appropriate custom subnet mask that provides:
Subnets
>= Physical Segments
Host
IDs >= Hosts per Physical Segment
Determine
the Subnet IDs
Determine
the ranges of Host IDs
Scenario 1
|
|
|
|
Required Number of Physical Segments: |
5 |
|
|
Maximum Number of Hosts/Physical Segment: |
5000 |
|
|
Network Address: |
152.77.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.224.0 |
|
|
Number of Subnets Supported: |
6 |
|
|
Maximum Number of Host ID per Subnet: |
8190 |
|
|
Subnet IDs: |
152.77.0.0
(Invalid) 152.77.32.0 152.77.64.0 152.77.96.0 152.77.128.0 152.77.160.0 152.77.192.0 152.77.224.0 (Invalid) |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
152.77.32.0 152.77.64.0 152.77.96.0 152.77.128.0 152.77.160.0 152.77.192.0 |
152.77.32.1 152.77.63.254 152.77.64.1 152.77.95.254 152.77.96.1 152.77.127.254 152.77.128.1 152.77.159.254 152.77.160.1 152.77.191.254 152.77.192.1 152.77.223.254 |
Scenario 2
|
|
|
|
Required Number of Physical Segments: |
100 |
|
|
Maximum Number of Hosts/Physical Segment: |
88,000 |
|
|
Network Address: |
39.0.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.254.0.0 |
|
|
Number of Subnets Supported: |
126 |
|
|
Maximum Number of Host ID per Subnet: |
131,070 |
|
|
Subnet IDs: |
39.2.0.0 39.4.0.0 39.6.0.0 39.8.0.0
39.254.0.0 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
39.2.0.0 39.4.0.0 39.6.0.0 39.8.0.0
39.252.0.0 |
39.2.0.1 39.3.255.254 39.4.0.1 39.5.255.254 39.6.0.1 39.7.255.254 39.8.0.1 39.9.255.254
39.252.0.1 39.253.255.254 |
Scenario 3
|
|
|
|
Required Number of Physical Segments: |
100 |
|
|
Maximum Number of Hosts/Physical Segment: |
350 |
|
|
Network Address: |
177.133.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.254.0 |
|
|
Number of Subnets Supported: |
126 |
|
|
Maximum Number of Host ID per Subnet: |
510 |
|
|
Subnet IDs: |
177.133.2.0 177.133.4.0 177.133.6.0 177.133.8.0
.. 177.133.252.0 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
177.133.2.0 177.133.4.0 177.133.6.0 177.133.8.0
.. 177.133.252.0 |
177.133.2.1 177.133.3.254 177.133.4.1 177.133.5.254 177.133.6.1 177.133.7.254 177.133.8.1 177.133.9.254
.. 177.133.252.1 177.133.253.254 |
(c) 1999 - 2001 Charles Botsford
Classroom use requires purchased license, see license agreement.
Scenario 4
|
|
|
|
Required Number of Physical Segments: |
4 |
|
|
Maximum Number of Hosts/Physical Segment: |
1,500,000 |
|
|
Network Address: |
120.0.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.224.0.0 |
|
|
Number of Subnets Supported: |
6 |
|
|
Maximum Number of Host ID per Subnet: |
2,097,150 |
|
|
Subnet IDs: |
120.32.0.0 120.64.0.0 120.96.0.0 120.128.0.0 120.160.0.0 120.192.0.0 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
120.32.0.0 120.64.0.0 120.96.0.0 120.128.0.0 120.160.0.0 120.192.0.0 |
120.32.0.1 120.63.255.254 120.64.0.1 120.95.255.254 120.96.0.1 120.127.255.254 120.128.0.1 120.159.255.254 120.160.0.1 120.191.255.254 120.192.0.1 120.223.255.254 |
Scenario 5
|
|
|
|
Required Number of Physical Segments: |
16 |
|
|
Maximum Number of Hosts/Physical Segment: |
1,500 |
|
|
Network Address: |
128.199.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.248.0 |
|
|
Number of Subnets Supported: |
30 |
|
|
Maximum Number of Host ID per Subnet: |
2,046 |
|
|
Subnet IDs: |
128.199.8.0 128.199.16.0 128.199.24.0 128.199.32.0
.. 128.199.240.0 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
128.199.8.0 128.199.16.0 128.199.24.0 128.199.32.0
.. 128.199.240.0 |
128.199.8.1 128.199.15.254 128.199.16.1 128.199.23.254 128.199.24.1 128.199.31.254 128.199.32.1 128.199.39.254
.. 128.199.240.1 128.199.247.254 |
(c) 1999 - 2001 Charles Botsford
Classroom use requires purchased license, see license agreement.
Scenario 6
|
|
|
|
Required Number of Physical Segments: |
250 |
|
|
Maximum Number of Hosts/Physical Segment: |
100 |
|
|
Network Address: |
191.254.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.255.0 |
|
|
Number of Subnets Supported: |
254 |
|
|
Maximum Number of Host ID per Subnet: |
254 |
|
|
Subnet IDs: |
191.254.1.0 191.254.2.0 191.254.3.0 191.254.4.0
191.254.254.0 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
191.254.1.0 191.254.2.0 191.254.3.0 191.254.4.0
191.254.254.0 |
191.254.1.1 191.254.1.254 191.254.2.1 191.254.2.254 191.254.3.1 191.254.3.254 191.254.4.1 191.254.4.254
191.254.254.1 191.254.254.254 |
Scenario 7
|
|
|
|
Required Number of Physical Segments: |
12 |
|
|
Maximum Number of Hosts/Physical Segment: |
12 |
|
|
Network Address: |
216.122.44.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.255.240 |
|
|
Number of Subnets Supported: |
14 |
|
|
Maximum Number of Host ID per Subnet: |
14 |
|
|
Subnet IDs: |
216.122.44.16 216.122.44.32 216.122.44.48 216.122.44.64
. 216.122.44.224 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
216.122.44.16 216.122.44.32 216.122.44.48 216.122.44.64
. 216.122.44.224 |
216.122.44.17 216.122.44.30 216.122.44.33 216.122.44.46 216.122.44.49 216.122.43.62 216.122.44.65 216.122.43.78
. 216.122.44.225 216.122.44.238 |
(c) 1999 - 2001 Charles Botsford
Classroom use requires purchased license, see license agreement.
Scenario 8
|
|
|
|
Required Number of Physical Segments: |
10 |
|
|
Maximum Number of Hosts/Physical Segment: |
750,000 |
|
|
Network Address: |
12.0.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.240.0.0 |
|
|
Number of Subnets Supported: |
14 |
|
|
Maximum Number of Host ID per Subnet: |
1,048,574 |
|
|
Subnet IDs: |
12.16.0.0 12.32.0.0 12.48.0.0 12.64.0.0
.. 12.224.0.0 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
12.16.0.0 12.32.0.0 12.48.0.0 12.64.0.0
.. 12.224.0.0 |
12.16.0.1 12.31.255.254 12.32.0.1 12.47.255.254 12.48.0.1 12.63.255.254 12.64.0.1 12.79.255.254
.. 12.224.0.1 12.239.255.254 |
Scenario 9
|
|
|
|
Required Number of Physical Segments: |
50 |
|
|
Maximum Number of Hosts/Physical Segment: |
600 |
|
|
Network Address: |
134.119.0.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.252.0 |
|
|
Number of Subnets Supported: |
62 |
|
|
Maximum Number of Host ID per Subnet: |
1022 |
|
|
Subnet IDs: |
134.119.4.0 134.119.8.0 134.119.12.0
.. 134.119.248.0 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
134.119.4.0 134.119.8.0 134.119.12.0
.. 134.119.248.0 |
134.119.4.1 134.119.7.254 134.119.8.1 134.119.11.254 134.119.12.1 134.119.15.254
.. 134.119.248.1 134.119.251.254 |
Scenario 10
|
|
|
|
Required Number of Physical Segments: |
3 |
|
|
Maximum Number of Hosts/Physical Segment: |
25 |
|
|
Network Address: |
192.177.4.0 |
|
|
|
|
|
|
Proposed Custom Subnet Mask: |
255.255.255.224 |
|
|
Number of Subnets Supported: |
6 |
|
|
Maximum Number of Host ID per Subnet: |
30 |
|
|
Subnet IDs: |
192.177.4.32 192.177.4.64 192.177.4.96
.. 192.177.4.192 |
|
|
|
|
1st Host Last Host on Subnet |
|
Host ID Ranges per Subnet |
192.177.4.32 192.177.4.64 192.177.4.96
.. 192.177.4.192 |
192.177.4.33 192.177.4.62 192.177.4.65 192.177.4.94 192.177.4.97 192.177.4.126
.. 192.177.4.193 192.177.4.222 |
(c) 1999 - 2001 Charles Botsford
Classroom use requires purchased license, see license agreement.