i needs help with clarification finding host bits and subnet bits

[dolanduck.]

Im confused on the host bits and sub-net bits when trying to design a networks.

1 can you have type c network go backwards for example 192.168.0.0

and i need  300 hosts and 200 sub-nets. is it possible.

2 do you need need a sub-net mask to find hosts and sub-nets in a networks for the question on top for example. or any other IP.

[Georg Pauwen · Accepted solution]

Hello,

in order to get 200 subnets with 300 hosts each, you need to start with 192.0.0.0/16, and work your way down.

Not sure what you mean by you second question, can you elaborate ?

Subnet ID	Subnet Address	Host Address Range	Broadcast Address
1	192.0.0.0	192.0.0.1 - 192.0.255.254	192.0.255.255
2	192.1.0.0	192.1.0.1 - 192.1.255.254	192.1.255.255
3	192.2.0.0	192.2.0.1 - 192.2.255.254	192.2.255.255
4	192.3.0.0	192.3.0.1 - 192.3.255.254	192.3.255.255
5	192.4.0.0	192.4.0.1 - 192.4.255.254	192.4.255.255
6	192.5.0.0	192.5.0.1 - 192.5.255.254	192.5.255.255
7	192.6.0.0	192.6.0.1 - 192.6.255.254	192.6.255.255
8	192.7.0.0	192.7.0.1 - 192.7.255.254	192.7.255.255
9	192.8.0.0	192.8.0.1 - 192.8.255.254	192.8.255.255
10	192.9.0.0	192.9.0.1 - 192.9.255.254	192.9.255.255
11	192.10.0.0	192.10.0.1 - 192.10.255.254	192.10.255.255
12	192.11.0.0	192.11.0.1 - 192.11.255.254	192.11.255.255
13	192.12.0.0	192.12.0.1 - 192.12.255.254	192.12.255.255
14	192.13.0.0	192.13.0.1 - 192.13.255.254	192.13.255.255
15	192.14.0.0	192.14.0.1 - 192.14.255.254	192.14.255.255
16	192.15.0.0	192.15.0.1 - 192.15.255.254	192.15.255.255
17	192.16.0.0	192.16.0.1 - 192.16.255.254	192.16.255.255
18	192.17.0.0	192.17.0.1 - 192.17.255.254	192.17.255.255
19	192.18.0.0	192.18.0.1 - 192.18.255.254	192.18.255.255
20	192.19.0.0	192.19.0.1 - 192.19.255.254	192.19.255.255
21	192.20.0.0	192.20.0.1 - 192.20.255.254	192.20.255.255
22	192.21.0.0	192.21.0.1 - 192.21.255.254	192.21.255.255
23	192.22.0.0	192.22.0.1 - 192.22.255.254	192.22.255.255
24	192.23.0.0	192.23.0.1 - 192.23.255.254	192.23.255.255
25	192.24.0.0	192.24.0.1 - 192.24.255.254	192.24.255.255
26	192.25.0.0	192.25.0.1 - 192.25.255.254	192.25.255.255
27	192.26.0.0	192.26.0.1 - 192.26.255.254	192.26.255.255
28	192.27.0.0	192.27.0.1 - 192.27.255.254	192.27.255.255
29	192.28.0.0	192.28.0.1 - 192.28.255.254	192.28.255.255
30	192.29.0.0	192.29.0.1 - 192.29.255.254	192.29.255.255
31	192.30.0.0	192.30.0.1 - 192.30.255.254	192.30.255.255
32	192.31.0.0	192.31.0.1 - 192.31.255.254	192.31.255.255
33	192.32.0.0	192.32.0.1 - 192.32.255.254	192.32.255.255
34	192.33.0.0	192.33.0.1 - 192.33.255.254	192.33.255.255
35	192.34.0.0	192.34.0.1 - 192.34.255.254	192.34.255.255
36	192.35.0.0	192.35.0.1 - 192.35.255.254	192.35.255.255
37	192.36.0.0	192.36.0.1 - 192.36.255.254	192.36.255.255
38	192.37.0.0	192.37.0.1 - 192.37.255.254	192.37.255.255
39	192.38.0.0	192.38.0.1 - 192.38.255.254	192.38.255.255
40	192.39.0.0	192.39.0.1 - 192.39.255.254	192.39.255.255
41	192.40.0.0	192.40.0.1 - 192.40.255.254	192.40.255.255
42	192.41.0.0	192.41.0.1 - 192.41.255.254	192.41.255.255
43	192.42.0.0	192.42.0.1 - 192.42.255.254	192.42.255.255
44	192.43.0.0	192.43.0.1 - 192.43.255.254	192.43.255.255
45	192.44.0.0	192.44.0.1 - 192.44.255.254	192.44.255.255
46	192.45.0.0	192.45.0.1 - 192.45.255.254	192.45.255.255
47	192.46.0.0	192.46.0.1 - 192.46.255.254	192.46.255.255
48	192.47.0.0	192.47.0.1 - 192.47.255.254	192.47.255.255
49	192.48.0.0	192.48.0.1 - 192.48.255.254	192.48.255.255
50	192.49.0.0	192.49.0.1 - 192.49.255.254	192.49.255.255
51	192.50.0.0	192.50.0.1 - 192.50.255.254	192.50.255.255
52	192.51.0.0	192.51.0.1 - 192.51.255.254	192.51.255.255
53	192.52.0.0	192.52.0.1 - 192.52.255.254	192.52.255.255
54	192.53.0.0	192.53.0.1 - 192.53.255.254	192.53.255.255
55	192.54.0.0	192.54.0.1 - 192.54.255.254	192.54.255.255
56	192.55.0.0	192.55.0.1 - 192.55.255.254	192.55.255.255
57	192.56.0.0	192.56.0.1 - 192.56.255.254	192.56.255.255
58	192.57.0.0	192.57.0.1 - 192.57.255.254	192.57.255.255
59	192.58.0.0	192.58.0.1 - 192.58.255.254	192.58.255.255
60	192.59.0.0	192.59.0.1 - 192.59.255.254	192.59.255.255
61	192.60.0.0	192.60.0.1 - 192.60.255.254	192.60.255.255
62	192.61.0.0	192.61.0.1 - 192.61.255.254	192.61.255.255
63	192.62.0.0	192.62.0.1 - 192.62.255.254	192.62.255.255
64	192.63.0.0	192.63.0.1 - 192.63.255.254	192.63.255.255
65	192.64.0.0	192.64.0.1 - 192.64.255.254	192.64.255.255
66	192.65.0.0	192.65.0.1 - 192.65.255.254	192.65.255.255
67	192.66.0.0	192.66.0.1 - 192.66.255.254	192.66.255.255
68	192.67.0.0	192.67.0.1 - 192.67.255.254	192.67.255.255
69	192.68.0.0	192.68.0.1 - 192.68.255.254	192.68.255.255
70	192.69.0.0	192.69.0.1 - 192.69.255.254	192.69.255.255
71	192.70.0.0	192.70.0.1 - 192.70.255.254	192.70.255.255
72	192.71.0.0	192.71.0.1 - 192.71.255.254	192.71.255.255
73	192.72.0.0	192.72.0.1 - 192.72.255.254	192.72.255.255
74	192.73.0.0	192.73.0.1 - 192.73.255.254	192.73.255.255
75	192.74.0.0	192.74.0.1 - 192.74.255.254	192.74.255.255
76	192.75.0.0	192.75.0.1 - 192.75.255.254	192.75.255.255
77	192.76.0.0	192.76.0.1 - 192.76.255.254	192.76.255.255
78	192.77.0.0	192.77.0.1 - 192.77.255.254	192.77.255.255
79	192.78.0.0	192.78.0.1 - 192.78.255.254	192.78.255.255
80	192.79.0.0	192.79.0.1 - 192.79.255.254	192.79.255.255
81	192.80.0.0	192.80.0.1 - 192.80.255.254	192.80.255.255
82	192.81.0.0	192.81.0.1 - 192.81.255.254	192.81.255.255
83	192.82.0.0	192.82.0.1 - 192.82.255.254	192.82.255.255
84	192.83.0.0	192.83.0.1 - 192.83.255.254	192.83.255.255
85	192.84.0.0	192.84.0.1 - 192.84.255.254	192.84.255.255
86	192.85.0.0	192.85.0.1 - 192.85.255.254	192.85.255.255
87	192.86.0.0	192.86.0.1 - 192.86.255.254	192.86.255.255
88	192.87.0.0	192.87.0.1 - 192.87.255.254	192.87.255.255
89	192.88.0.0	192.88.0.1 - 192.88.255.254	192.88.255.255
90	192.89.0.0	192.89.0.1 - 192.89.255.254	192.89.255.255
91	192.90.0.0	192.90.0.1 - 192.90.255.254	192.90.255.255
92	192.91.0.0	192.91.0.1 - 192.91.255.254	192.91.255.255
93	192.92.0.0	192.92.0.1 - 192.92.255.254	192.92.255.255
94	192.93.0.0	192.93.0.1 - 192.93.255.254	192.93.255.255
95	192.94.0.0	192.94.0.1 - 192.94.255.254	192.94.255.255
96	192.95.0.0	192.95.0.1 - 192.95.255.254	192.95.255.255
97	192.96.0.0	192.96.0.1 - 192.96.255.254	192.96.255.255
98	192.97.0.0	192.97.0.1 - 192.97.255.254	192.97.255.255
99	192.98.0.0	192.98.0.1 - 192.98.255.254	192.98.255.255
100	192.99.0.0	192.99.0.1 - 192.99.255.254	192.99.255.255
101	192.100.0.0	192.100.0.1 - 192.100.255.254	192.100.255.255
102	192.101.0.0	192.101.0.1 - 192.101.255.254	192.101.255.255
103	192.102.0.0	192.102.0.1 - 192.102.255.254	192.102.255.255
104	192.103.0.0	192.103.0.1 - 192.103.255.254	192.103.255.255
105	192.104.0.0	192.104.0.1 - 192.104.255.254	192.104.255.255
106	192.105.0.0	192.105.0.1 - 192.105.255.254	192.105.255.255
107	192.106.0.0	192.106.0.1 - 192.106.255.254	192.106.255.255
108	192.107.0.0	192.107.0.1 - 192.107.255.254	192.107.255.255
109	192.108.0.0	192.108.0.1 - 192.108.255.254	192.108.255.255
110	192.109.0.0	192.109.0.1 - 192.109.255.254	192.109.255.255
111	192.110.0.0	192.110.0.1 - 192.110.255.254	192.110.255.255
112	192.111.0.0	192.111.0.1 - 192.111.255.254	192.111.255.255
113	192.112.0.0	192.112.0.1 - 192.112.255.254	192.112.255.255
114	192.113.0.0	192.113.0.1 - 192.113.255.254	192.113.255.255
115	192.114.0.0	192.114.0.1 - 192.114.255.254	192.114.255.255
116	192.115.0.0	192.115.0.1 - 192.115.255.254	192.115.255.255
117	192.116.0.0	192.116.0.1 - 192.116.255.254	192.116.255.255
118	192.117.0.0	192.117.0.1 - 192.117.255.254	192.117.255.255
119	192.118.0.0	192.118.0.1 - 192.118.255.254	192.118.255.255
120	192.119.0.0	192.119.0.1 - 192.119.255.254	192.119.255.255
121	192.120.0.0	192.120.0.1 - 192.120.255.254	192.120.255.255
122	192.121.0.0	192.121.0.1 - 192.121.255.254	192.121.255.255
123	192.122.0.0	192.122.0.1 - 192.122.255.254	192.122.255.255
124	192.123.0.0	192.123.0.1 - 192.123.255.254	192.123.255.255
125	192.124.0.0	192.124.0.1 - 192.124.255.254	192.124.255.255
126	192.125.0.0	192.125.0.1 - 192.125.255.254	192.125.255.255
127	192.126.0.0	192.126.0.1 - 192.126.255.254	192.126.255.255
128	192.127.0.0	192.127.0.1 - 192.127.255.254	192.127.255.255
129	192.128.0.0	192.128.0.1 - 192.128.255.254	192.128.255.255
130	192.129.0.0	192.129.0.1 - 192.129.255.254	192.129.255.255
131	192.130.0.0	192.130.0.1 - 192.130.255.254	192.130.255.255
132	192.131.0.0	192.131.0.1 - 192.131.255.254	192.131.255.255
133	192.132.0.0	192.132.0.1 - 192.132.255.254	192.132.255.255
134	192.133.0.0	192.133.0.1 - 192.133.255.254	192.133.255.255
135	192.134.0.0	192.134.0.1 - 192.134.255.254	192.134.255.255
136	192.135.0.0	192.135.0.1 - 192.135.255.254	192.135.255.255
137	192.136.0.0	192.136.0.1 - 192.136.255.254	192.136.255.255
138	192.137.0.0	192.137.0.1 - 192.137.255.254	192.137.255.255
139	192.138.0.0	192.138.0.1 - 192.138.255.254	192.138.255.255
140	192.139.0.0	192.139.0.1 - 192.139.255.254	192.139.255.255
141	192.140.0.0	192.140.0.1 - 192.140.255.254	192.140.255.255
142	192.141.0.0	192.141.0.1 - 192.141.255.254	192.141.255.255
143	192.142.0.0	192.142.0.1 - 192.142.255.254	192.142.255.255
144	192.143.0.0	192.143.0.1 - 192.143.255.254	192.143.255.255
145	192.144.0.0	192.144.0.1 - 192.144.255.254	192.144.255.255
146	192.145.0.0	192.145.0.1 - 192.145.255.254	192.145.255.255
147	192.146.0.0	192.146.0.1 - 192.146.255.254	192.146.255.255
148	192.147.0.0	192.147.0.1 - 192.147.255.254	192.147.255.255
149	192.148.0.0	192.148.0.1 - 192.148.255.254	192.148.255.255
150	192.149.0.0	192.149.0.1 - 192.149.255.254	192.149.255.255
151	192.150.0.0	192.150.0.1 - 192.150.255.254	192.150.255.255
152	192.151.0.0	192.151.0.1 - 192.151.255.254	192.151.255.255
153	192.152.0.0	192.152.0.1 - 192.152.255.254	192.152.255.255
154	192.153.0.0	192.153.0.1 - 192.153.255.254	192.153.255.255
155	192.154.0.0	192.154.0.1 - 192.154.255.254	192.154.255.255
156	192.155.0.0	192.155.0.1 - 192.155.255.254	192.155.255.255
157	192.156.0.0	192.156.0.1 - 192.156.255.254	192.156.255.255
158	192.157.0.0	192.157.0.1 - 192.157.255.254	192.157.255.255
159	192.158.0.0	192.158.0.1 - 192.158.255.254	192.158.255.255
160	192.159.0.0	192.159.0.1 - 192.159.255.254	192.159.255.255
161	192.160.0.0	192.160.0.1 - 192.160.255.254	192.160.255.255
162	192.161.0.0	192.161.0.1 - 192.161.255.254	192.161.255.255
163	192.162.0.0	192.162.0.1 - 192.162.255.254	192.162.255.255
164	192.163.0.0	192.163.0.1 - 192.163.255.254	192.163.255.255
165	192.164.0.0	192.164.0.1 - 192.164.255.254	192.164.255.255
166	192.165.0.0	192.165.0.1 - 192.165.255.254	192.165.255.255
167	192.166.0.0	192.166.0.1 - 192.166.255.254	192.166.255.255
168	192.167.0.0	192.167.0.1 - 192.167.255.254	192.167.255.255
169	192.168.0.0	192.168.0.1 - 192.168.255.254	192.168.255.255
170	192.169.0.0	192.169.0.1 - 192.169.255.254	192.169.255.255
171	192.170.0.0	192.170.0.1 - 192.170.255.254	192.170.255.255
172	192.171.0.0	192.171.0.1 - 192.171.255.254	192.171.255.255
173	192.172.0.0	192.172.0.1 - 192.172.255.254	192.172.255.255
174	192.173.0.0	192.173.0.1 - 192.173.255.254	192.173.255.255
175	192.174.0.0	192.174.0.1 - 192.174.255.254	192.174.255.255
176	192.175.0.0	192.175.0.1 - 192.175.255.254	192.175.255.255
177	192.176.0.0	192.176.0.1 - 192.176.255.254	192.176.255.255
178	192.177.0.0	192.177.0.1 - 192.177.255.254	192.177.255.255
179	192.178.0.0	192.178.0.1 - 192.178.255.254	192.178.255.255
180	192.179.0.0	192.179.0.1 - 192.179.255.254	192.179.255.255
181	192.180.0.0	192.180.0.1 - 192.180.255.254	192.180.255.255
182	192.181.0.0	192.181.0.1 - 192.181.255.254	192.181.255.255
183	192.182.0.0	192.182.0.1 - 192.182.255.254	192.182.255.255
184	192.183.0.0	192.183.0.1 - 192.183.255.254	192.183.255.255
185	192.184.0.0	192.184.0.1 - 192.184.255.254	192.184.255.255
186	192.185.0.0	192.185.0.1 - 192.185.255.254	192.185.255.255
187	192.186.0.0	192.186.0.1 - 192.186.255.254	192.186.255.255
188	192.187.0.0	192.187.0.1 - 192.187.255.254	192.187.255.255
189	192.188.0.0	192.188.0.1 - 192.188.255.254	192.188.255.255
190	192.189.0.0	192.189.0.1 - 192.189.255.254	192.189.255.255
191	192.190.0.0	192.190.0.1 - 192.190.255.254	192.190.255.255
192	192.191.0.0	192.191.0.1 - 192.191.255.254	192.191.255.255
193	192.192.0.0	192.192.0.1 - 192.192.255.254	192.192.255.255
194	192.193.0.0	192.193.0.1 - 192.193.255.254	192.193.255.255
195	192.194.0.0	192.194.0.1 - 192.194.255.254	192.194.255.255
196	192.195.0.0	192.195.0.1 - 192.195.255.254	192.195.255.255
197	192.196.0.0	192.196.0.1 - 192.196.255.254	192.196.255.255
198	192.197.0.0	192.197.0.1 - 192.197.255.254	192.197.255.255
199	192.198.0.0	192.198.0.1 - 192.198.255.254	192.198.255.255
200	192.199.0.0	192.199.0.1 - 192.199.255.254	192.199.255.255
201	192.200.0.0	192.200.0.1 - 192.200.255.254	192.200.255.255
202	192.201.0.0	192.201.0.1 - 192.201.255.254	192.201.255.255
203	192.202.0.0	192.202.0.1 - 192.202.255.254	192.202.255.255
204	192.203.0.0	192.203.0.1 - 192.203.255.254	192.203.255.255
205	192.204.0.0	192.204.0.1 - 192.204.255.254	192.204.255.255
206	192.205.0.0	192.205.0.1 - 192.205.255.254	192.205.255.255
207	192.206.0.0	192.206.0.1 - 192.206.255.254	192.206.255.255
208	192.207.0.0	192.207.0.1 - 192.207.255.254	192.207.255.255
209	192.208.0.0	192.208.0.1 - 192.208.255.254	192.208.255.255
210	192.209.0.0	192.209.0.1 - 192.209.255.254	192.209.255.255
211	192.210.0.0	192.210.0.1 - 192.210.255.254	192.210.255.255
212	192.211.0.0	192.211.0.1 - 192.211.255.254	192.211.255.255
213	192.212.0.0	192.212.0.1 - 192.212.255.254	192.212.255.255
214	192.213.0.0	192.213.0.1 - 192.213.255.254	192.213.255.255
215	192.214.0.0	192.214.0.1 - 192.214.255.254	192.214.255.255
216	192.215.0.0	192.215.0.1 - 192.215.255.254	192.215.255.255
217	192.216.0.0	192.216.0.1 - 192.216.255.254	192.216.255.255
218	192.217.0.0	192.217.0.1 - 192.217.255.254	192.217.255.255
219	192.218.0.0	192.218.0.1 - 192.218.255.254	192.218.255.255
220	192.219.0.0	192.219.0.1 - 192.219.255.254	192.219.255.255
221	192.220.0.0	192.220.0.1 - 192.220.255.254	192.220.255.255
222	192.221.0.0	192.221.0.1 - 192.221.255.254	192.221.255.255
223	192.222.0.0	192.222.0.1 - 192.222.255.254	192.222.255.255
224	192.223.0.0	192.223.0.1 - 192.223.255.254	192.223.255.255
225	192.224.0.0	192.224.0.1 - 192.224.255.254	192.224.255.255
226	192.225.0.0	192.225.0.1 - 192.225.255.254	192.225.255.255
227	192.226.0.0	192.226.0.1 - 192.226.255.254	192.226.255.255
228	192.227.0.0	192.227.0.1 - 192.227.255.254	192.227.255.255
229	192.228.0.0	192.228.0.1 - 192.228.255.254	192.228.255.255
230	192.229.0.0	192.229.0.1 - 192.229.255.254	192.229.255.255
231	192.230.0.0	192.230.0.1 - 192.230.255.254	192.230.255.255
232	192.231.0.0	192.231.0.1 - 192.231.255.254	192.231.255.255
233	192.232.0.0	192.232.0.1 - 192.232.255.254	192.232.255.255
234	192.233.0.0	192.233.0.1 - 192.233.255.254	192.233.255.255
235	192.234.0.0	192.234.0.1 - 192.234.255.254	192.234.255.255
236	192.235.0.0	192.235.0.1 - 192.235.255.254	192.235.255.255
237	192.236.0.0	192.236.0.1 - 192.236.255.254	192.236.255.255
238	192.237.0.0	192.237.0.1 - 192.237.255.254	192.237.255.255
239	192.238.0.0	192.238.0.1 - 192.238.255.254	192.238.255.255
240	192.239.0.0	192.239.0.1 - 192.239.255.254	192.239.255.255
241	192.240.0.0	192.240.0.1 - 192.240.255.254	192.240.255.255
242	192.241.0.0	192.241.0.1 - 192.241.255.254	192.241.255.255
243	192.242.0.0	192.242.0.1 - 192.242.255.254	192.242.255.255
244	192.243.0.0	192.243.0.1 - 192.243.255.254	192.243.255.255
245	192.244.0.0	192.244.0.1 - 192.244.255.254	192.244.255.255
246	192.245.0.0	192.245.0.1 - 192.245.255.254	192.245.255.255
247	192.246.0.0	192.246.0.1 - 192.246.255.254	192.246.255.255
248	192.247.0.0	192.247.0.1 - 192.247.255.254	192.247.255.255
249	192.248.0.0	192.248.0.1 - 192.248.255.254	192.248.255.255
250	192.249.0.0	192.249.0.1 - 192.249.255.254	192.249.255.255
251	192.250.0.0	192.250.0.1 - 192.250.255.254	192.250.255.255
252	192.251.0.0	192.251.0.1 - 192.251.255.254	192.251.255.255
253	192.252.0.0	192.252.0.1 - 192.252.255.254	192.252.255.255
254	192.253.0.0	192.253.0.1 - 192.253.255.254	192.253.255.255
255	192.254.0.0	192.254.0.1 - 192.254.255.254	192.254.255.255
256	192.255.0.0	192.255.0.1 - 192.255.255.254	192.255.255.255

[Joseph W. Doherty]

BTW, what Georg suggests provides both the number of networks needed, each which can contain 300 hosts. However, two points to keep in mind.

First, these networks are /16s, perhaps "larger" than needed, and second, although the 192.168.0.0/16 block is "private" some of the other 192.0.0.0/8 address space has other defined uses, see: https://en.wikipedia.org/wiki/IPv4#Special-use_addresses and those not so defined, are public, I believe.

[paul driver]

Hello

Please review the attach document

[Joseph W. Doherty]

Hmm, for starters, when you mention sub-net bits and a "type c" (Class C?), you're delving into, more-or-less, somewhat "archaic" network technology. Your question is sort of like asking, how many spokes should a chariot wheel have.

Anyway, yes you can go "backward" from a Class C network. This is actually known as supernetting.

See:
https://www.geeksforgeeks.org/supernetting-in-network-layer/
https://www.computernetworkingnotes.com/ccna-study-guide/supernetting-tutorial-supernetting-explained-with-examples.html

If you were to use (current) classless networking, 300 hosts would require a /23 network, and the 200 networks needed could be used from /23s found in IPv4 address space, private (probably) or public (not very likely). BTW, if you hope to only use the private IPv4 address block 192.168.0.0/16, there's only 128 /23s within it. (See: https://en.wikipedia.org/wiki/Private_network)