IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.2.0.0/17

network10.2.0.0/17

broadcast10.2.127.255

first host10.2.0.1

last host10.2.127.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.2.0.0/17

address00001010.00000010.00000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.00000010.00000000.00000000

broadcast00001010.00000010.01111111.11111111

green = network part, grey = host part

hex0x0a020000

decimal167903232

reverse dns0.0.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:0

/17 split into /25 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.0.0/25	10.2.0.1 – 10.2.0.126	10.2.0.127
2	10.2.0.128/25	10.2.0.129 – 10.2.0.254	10.2.0.255
3	10.2.1.0/25	10.2.1.1 – 10.2.1.126	10.2.1.127
4	10.2.1.128/25	10.2.1.129 – 10.2.1.254	10.2.1.255
5	10.2.2.0/25	10.2.2.1 – 10.2.2.126	10.2.2.127
6	10.2.2.128/25	10.2.2.129 – 10.2.2.254	10.2.2.255
7	10.2.3.0/25	10.2.3.1 – 10.2.3.126	10.2.3.127
8	10.2.3.128/25	10.2.3.129 – 10.2.3.254	10.2.3.255
9	10.2.4.0/25	10.2.4.1 – 10.2.4.126	10.2.4.127
10	10.2.4.128/25	10.2.4.129 – 10.2.4.254	10.2.4.255
11	10.2.5.0/25	10.2.5.1 – 10.2.5.126	10.2.5.127
12	10.2.5.128/25	10.2.5.129 – 10.2.5.254	10.2.5.255
13	10.2.6.0/25	10.2.6.1 – 10.2.6.126	10.2.6.127
14	10.2.6.128/25	10.2.6.129 – 10.2.6.254	10.2.6.255
15	10.2.7.0/25	10.2.7.1 – 10.2.7.126	10.2.7.127
16	10.2.7.128/25	10.2.7.129 – 10.2.7.254	10.2.7.255
17	10.2.8.0/25	10.2.8.1 – 10.2.8.126	10.2.8.127
18	10.2.8.128/25	10.2.8.129 – 10.2.8.254	10.2.8.255
19	10.2.9.0/25	10.2.9.1 – 10.2.9.126	10.2.9.127
20	10.2.9.128/25	10.2.9.129 – 10.2.9.254	10.2.9.255
21	10.2.10.0/25	10.2.10.1 – 10.2.10.126	10.2.10.127
22	10.2.10.128/25	10.2.10.129 – 10.2.10.254	10.2.10.255
23	10.2.11.0/25	10.2.11.1 – 10.2.11.126	10.2.11.127
24	10.2.11.128/25	10.2.11.129 – 10.2.11.254	10.2.11.255
25	10.2.12.0/25	10.2.12.1 – 10.2.12.126	10.2.12.127
26	10.2.12.128/25	10.2.12.129 – 10.2.12.254	10.2.12.255
27	10.2.13.0/25	10.2.13.1 – 10.2.13.126	10.2.13.127
28	10.2.13.128/25	10.2.13.129 – 10.2.13.254	10.2.13.255
29	10.2.14.0/25	10.2.14.1 – 10.2.14.126	10.2.14.127
30	10.2.14.128/25	10.2.14.129 – 10.2.14.254	10.2.14.255
31	10.2.15.0/25	10.2.15.1 – 10.2.15.126	10.2.15.127
32	10.2.15.128/25	10.2.15.129 – 10.2.15.254	10.2.15.255
33	10.2.16.0/25	10.2.16.1 – 10.2.16.126	10.2.16.127
34	10.2.16.128/25	10.2.16.129 – 10.2.16.254	10.2.16.255
35	10.2.17.0/25	10.2.17.1 – 10.2.17.126	10.2.17.127
36	10.2.17.128/25	10.2.17.129 – 10.2.17.254	10.2.17.255
37	10.2.18.0/25	10.2.18.1 – 10.2.18.126	10.2.18.127
38	10.2.18.128/25	10.2.18.129 – 10.2.18.254	10.2.18.255
39	10.2.19.0/25	10.2.19.1 – 10.2.19.126	10.2.19.127
40	10.2.19.128/25	10.2.19.129 – 10.2.19.254	10.2.19.255
41	10.2.20.0/25	10.2.20.1 – 10.2.20.126	10.2.20.127
42	10.2.20.128/25	10.2.20.129 – 10.2.20.254	10.2.20.255
43	10.2.21.0/25	10.2.21.1 – 10.2.21.126	10.2.21.127
44	10.2.21.128/25	10.2.21.129 – 10.2.21.254	10.2.21.255
45	10.2.22.0/25	10.2.22.1 – 10.2.22.126	10.2.22.127
46	10.2.22.128/25	10.2.22.129 – 10.2.22.254	10.2.22.255
47	10.2.23.0/25	10.2.23.1 – 10.2.23.126	10.2.23.127
48	10.2.23.128/25	10.2.23.129 – 10.2.23.254	10.2.23.255
49	10.2.24.0/25	10.2.24.1 – 10.2.24.126	10.2.24.127
50	10.2.24.128/25	10.2.24.129 – 10.2.24.254	10.2.24.255
51	10.2.25.0/25	10.2.25.1 – 10.2.25.126	10.2.25.127
52	10.2.25.128/25	10.2.25.129 – 10.2.25.254	10.2.25.255
53	10.2.26.0/25	10.2.26.1 – 10.2.26.126	10.2.26.127
54	10.2.26.128/25	10.2.26.129 – 10.2.26.254	10.2.26.255
55	10.2.27.0/25	10.2.27.1 – 10.2.27.126	10.2.27.127
56	10.2.27.128/25	10.2.27.129 – 10.2.27.254	10.2.27.255
57	10.2.28.0/25	10.2.28.1 – 10.2.28.126	10.2.28.127
58	10.2.28.128/25	10.2.28.129 – 10.2.28.254	10.2.28.255
59	10.2.29.0/25	10.2.29.1 – 10.2.29.126	10.2.29.127
60	10.2.29.128/25	10.2.29.129 – 10.2.29.254	10.2.29.255
61	10.2.30.0/25	10.2.30.1 – 10.2.30.126	10.2.30.127
62	10.2.30.128/25	10.2.30.129 – 10.2.30.254	10.2.30.255
63	10.2.31.0/25	10.2.31.1 – 10.2.31.126	10.2.31.127
64	10.2.31.128/25	10.2.31.129 – 10.2.31.254	10.2.31.255
65	10.2.32.0/25	10.2.32.1 – 10.2.32.126	10.2.32.127
66	10.2.32.128/25	10.2.32.129 – 10.2.32.254	10.2.32.255
67	10.2.33.0/25	10.2.33.1 – 10.2.33.126	10.2.33.127
68	10.2.33.128/25	10.2.33.129 – 10.2.33.254	10.2.33.255
69	10.2.34.0/25	10.2.34.1 – 10.2.34.126	10.2.34.127
70	10.2.34.128/25	10.2.34.129 – 10.2.34.254	10.2.34.255
71	10.2.35.0/25	10.2.35.1 – 10.2.35.126	10.2.35.127
72	10.2.35.128/25	10.2.35.129 – 10.2.35.254	10.2.35.255
73	10.2.36.0/25	10.2.36.1 – 10.2.36.126	10.2.36.127
74	10.2.36.128/25	10.2.36.129 – 10.2.36.254	10.2.36.255
75	10.2.37.0/25	10.2.37.1 – 10.2.37.126	10.2.37.127
76	10.2.37.128/25	10.2.37.129 – 10.2.37.254	10.2.37.255
77	10.2.38.0/25	10.2.38.1 – 10.2.38.126	10.2.38.127
78	10.2.38.128/25	10.2.38.129 – 10.2.38.254	10.2.38.255
79	10.2.39.0/25	10.2.39.1 – 10.2.39.126	10.2.39.127
80	10.2.39.128/25	10.2.39.129 – 10.2.39.254	10.2.39.255
81	10.2.40.0/25	10.2.40.1 – 10.2.40.126	10.2.40.127
82	10.2.40.128/25	10.2.40.129 – 10.2.40.254	10.2.40.255
83	10.2.41.0/25	10.2.41.1 – 10.2.41.126	10.2.41.127
84	10.2.41.128/25	10.2.41.129 – 10.2.41.254	10.2.41.255
85	10.2.42.0/25	10.2.42.1 – 10.2.42.126	10.2.42.127
86	10.2.42.128/25	10.2.42.129 – 10.2.42.254	10.2.42.255
87	10.2.43.0/25	10.2.43.1 – 10.2.43.126	10.2.43.127
88	10.2.43.128/25	10.2.43.129 – 10.2.43.254	10.2.43.255
89	10.2.44.0/25	10.2.44.1 – 10.2.44.126	10.2.44.127
90	10.2.44.128/25	10.2.44.129 – 10.2.44.254	10.2.44.255
91	10.2.45.0/25	10.2.45.1 – 10.2.45.126	10.2.45.127
92	10.2.45.128/25	10.2.45.129 – 10.2.45.254	10.2.45.255
93	10.2.46.0/25	10.2.46.1 – 10.2.46.126	10.2.46.127
94	10.2.46.128/25	10.2.46.129 – 10.2.46.254	10.2.46.255
95	10.2.47.0/25	10.2.47.1 – 10.2.47.126	10.2.47.127
96	10.2.47.128/25	10.2.47.129 – 10.2.47.254	10.2.47.255
97	10.2.48.0/25	10.2.48.1 – 10.2.48.126	10.2.48.127
98	10.2.48.128/25	10.2.48.129 – 10.2.48.254	10.2.48.255
99	10.2.49.0/25	10.2.49.1 – 10.2.49.126	10.2.49.127
100	10.2.49.128/25	10.2.49.129 – 10.2.49.254	10.2.49.255
101	10.2.50.0/25	10.2.50.1 – 10.2.50.126	10.2.50.127
102	10.2.50.128/25	10.2.50.129 – 10.2.50.254	10.2.50.255
103	10.2.51.0/25	10.2.51.1 – 10.2.51.126	10.2.51.127
104	10.2.51.128/25	10.2.51.129 – 10.2.51.254	10.2.51.255
105	10.2.52.0/25	10.2.52.1 – 10.2.52.126	10.2.52.127
106	10.2.52.128/25	10.2.52.129 – 10.2.52.254	10.2.52.255
107	10.2.53.0/25	10.2.53.1 – 10.2.53.126	10.2.53.127
108	10.2.53.128/25	10.2.53.129 – 10.2.53.254	10.2.53.255
109	10.2.54.0/25	10.2.54.1 – 10.2.54.126	10.2.54.127
110	10.2.54.128/25	10.2.54.129 – 10.2.54.254	10.2.54.255
111	10.2.55.0/25	10.2.55.1 – 10.2.55.126	10.2.55.127
112	10.2.55.128/25	10.2.55.129 – 10.2.55.254	10.2.55.255
113	10.2.56.0/25	10.2.56.1 – 10.2.56.126	10.2.56.127
114	10.2.56.128/25	10.2.56.129 – 10.2.56.254	10.2.56.255
115	10.2.57.0/25	10.2.57.1 – 10.2.57.126	10.2.57.127
116	10.2.57.128/25	10.2.57.129 – 10.2.57.254	10.2.57.255
117	10.2.58.0/25	10.2.58.1 – 10.2.58.126	10.2.58.127
118	10.2.58.128/25	10.2.58.129 – 10.2.58.254	10.2.58.255
119	10.2.59.0/25	10.2.59.1 – 10.2.59.126	10.2.59.127
120	10.2.59.128/25	10.2.59.129 – 10.2.59.254	10.2.59.255
121	10.2.60.0/25	10.2.60.1 – 10.2.60.126	10.2.60.127
122	10.2.60.128/25	10.2.60.129 – 10.2.60.254	10.2.60.255
123	10.2.61.0/25	10.2.61.1 – 10.2.61.126	10.2.61.127
124	10.2.61.128/25	10.2.61.129 – 10.2.61.254	10.2.61.255
125	10.2.62.0/25	10.2.62.1 – 10.2.62.126	10.2.62.127
126	10.2.62.128/25	10.2.62.129 – 10.2.62.254	10.2.62.255
127	10.2.63.0/25	10.2.63.1 – 10.2.63.126	10.2.63.127
128	10.2.63.128/25	10.2.63.129 – 10.2.63.254	10.2.63.255
129	10.2.64.0/25	10.2.64.1 – 10.2.64.126	10.2.64.127
130	10.2.64.128/25	10.2.64.129 – 10.2.64.254	10.2.64.255
131	10.2.65.0/25	10.2.65.1 – 10.2.65.126	10.2.65.127
132	10.2.65.128/25	10.2.65.129 – 10.2.65.254	10.2.65.255
133	10.2.66.0/25	10.2.66.1 – 10.2.66.126	10.2.66.127
134	10.2.66.128/25	10.2.66.129 – 10.2.66.254	10.2.66.255
135	10.2.67.0/25	10.2.67.1 – 10.2.67.126	10.2.67.127
136	10.2.67.128/25	10.2.67.129 – 10.2.67.254	10.2.67.255
137	10.2.68.0/25	10.2.68.1 – 10.2.68.126	10.2.68.127
138	10.2.68.128/25	10.2.68.129 – 10.2.68.254	10.2.68.255
139	10.2.69.0/25	10.2.69.1 – 10.2.69.126	10.2.69.127
140	10.2.69.128/25	10.2.69.129 – 10.2.69.254	10.2.69.255
141	10.2.70.0/25	10.2.70.1 – 10.2.70.126	10.2.70.127
142	10.2.70.128/25	10.2.70.129 – 10.2.70.254	10.2.70.255
143	10.2.71.0/25	10.2.71.1 – 10.2.71.126	10.2.71.127
144	10.2.71.128/25	10.2.71.129 – 10.2.71.254	10.2.71.255
145	10.2.72.0/25	10.2.72.1 – 10.2.72.126	10.2.72.127
146	10.2.72.128/25	10.2.72.129 – 10.2.72.254	10.2.72.255
147	10.2.73.0/25	10.2.73.1 – 10.2.73.126	10.2.73.127
148	10.2.73.128/25	10.2.73.129 – 10.2.73.254	10.2.73.255
149	10.2.74.0/25	10.2.74.1 – 10.2.74.126	10.2.74.127
150	10.2.74.128/25	10.2.74.129 – 10.2.74.254	10.2.74.255
151	10.2.75.0/25	10.2.75.1 – 10.2.75.126	10.2.75.127
152	10.2.75.128/25	10.2.75.129 – 10.2.75.254	10.2.75.255
153	10.2.76.0/25	10.2.76.1 – 10.2.76.126	10.2.76.127
154	10.2.76.128/25	10.2.76.129 – 10.2.76.254	10.2.76.255
155	10.2.77.0/25	10.2.77.1 – 10.2.77.126	10.2.77.127
156	10.2.77.128/25	10.2.77.129 – 10.2.77.254	10.2.77.255
157	10.2.78.0/25	10.2.78.1 – 10.2.78.126	10.2.78.127
158	10.2.78.128/25	10.2.78.129 – 10.2.78.254	10.2.78.255
159	10.2.79.0/25	10.2.79.1 – 10.2.79.126	10.2.79.127
160	10.2.79.128/25	10.2.79.129 – 10.2.79.254	10.2.79.255
161	10.2.80.0/25	10.2.80.1 – 10.2.80.126	10.2.80.127
162	10.2.80.128/25	10.2.80.129 – 10.2.80.254	10.2.80.255
163	10.2.81.0/25	10.2.81.1 – 10.2.81.126	10.2.81.127
164	10.2.81.128/25	10.2.81.129 – 10.2.81.254	10.2.81.255
165	10.2.82.0/25	10.2.82.1 – 10.2.82.126	10.2.82.127
166	10.2.82.128/25	10.2.82.129 – 10.2.82.254	10.2.82.255
167	10.2.83.0/25	10.2.83.1 – 10.2.83.126	10.2.83.127
168	10.2.83.128/25	10.2.83.129 – 10.2.83.254	10.2.83.255
169	10.2.84.0/25	10.2.84.1 – 10.2.84.126	10.2.84.127
170	10.2.84.128/25	10.2.84.129 – 10.2.84.254	10.2.84.255
171	10.2.85.0/25	10.2.85.1 – 10.2.85.126	10.2.85.127
172	10.2.85.128/25	10.2.85.129 – 10.2.85.254	10.2.85.255
173	10.2.86.0/25	10.2.86.1 – 10.2.86.126	10.2.86.127
174	10.2.86.128/25	10.2.86.129 – 10.2.86.254	10.2.86.255
175	10.2.87.0/25	10.2.87.1 – 10.2.87.126	10.2.87.127
176	10.2.87.128/25	10.2.87.129 – 10.2.87.254	10.2.87.255
177	10.2.88.0/25	10.2.88.1 – 10.2.88.126	10.2.88.127
178	10.2.88.128/25	10.2.88.129 – 10.2.88.254	10.2.88.255
179	10.2.89.0/25	10.2.89.1 – 10.2.89.126	10.2.89.127
180	10.2.89.128/25	10.2.89.129 – 10.2.89.254	10.2.89.255
181	10.2.90.0/25	10.2.90.1 – 10.2.90.126	10.2.90.127
182	10.2.90.128/25	10.2.90.129 – 10.2.90.254	10.2.90.255
183	10.2.91.0/25	10.2.91.1 – 10.2.91.126	10.2.91.127
184	10.2.91.128/25	10.2.91.129 – 10.2.91.254	10.2.91.255
185	10.2.92.0/25	10.2.92.1 – 10.2.92.126	10.2.92.127
186	10.2.92.128/25	10.2.92.129 – 10.2.92.254	10.2.92.255
187	10.2.93.0/25	10.2.93.1 – 10.2.93.126	10.2.93.127
188	10.2.93.128/25	10.2.93.129 – 10.2.93.254	10.2.93.255
189	10.2.94.0/25	10.2.94.1 – 10.2.94.126	10.2.94.127
190	10.2.94.128/25	10.2.94.129 – 10.2.94.254	10.2.94.255
191	10.2.95.0/25	10.2.95.1 – 10.2.95.126	10.2.95.127
192	10.2.95.128/25	10.2.95.129 – 10.2.95.254	10.2.95.255
193	10.2.96.0/25	10.2.96.1 – 10.2.96.126	10.2.96.127
194	10.2.96.128/25	10.2.96.129 – 10.2.96.254	10.2.96.255
195	10.2.97.0/25	10.2.97.1 – 10.2.97.126	10.2.97.127
196	10.2.97.128/25	10.2.97.129 – 10.2.97.254	10.2.97.255
197	10.2.98.0/25	10.2.98.1 – 10.2.98.126	10.2.98.127
198	10.2.98.128/25	10.2.98.129 – 10.2.98.254	10.2.98.255
199	10.2.99.0/25	10.2.99.1 – 10.2.99.126	10.2.99.127
200	10.2.99.128/25	10.2.99.129 – 10.2.99.254	10.2.99.255
201	10.2.100.0/25	10.2.100.1 – 10.2.100.126	10.2.100.127
202	10.2.100.128/25	10.2.100.129 – 10.2.100.254	10.2.100.255
203	10.2.101.0/25	10.2.101.1 – 10.2.101.126	10.2.101.127
204	10.2.101.128/25	10.2.101.129 – 10.2.101.254	10.2.101.255
205	10.2.102.0/25	10.2.102.1 – 10.2.102.126	10.2.102.127
206	10.2.102.128/25	10.2.102.129 – 10.2.102.254	10.2.102.255
207	10.2.103.0/25	10.2.103.1 – 10.2.103.126	10.2.103.127
208	10.2.103.128/25	10.2.103.129 – 10.2.103.254	10.2.103.255
209	10.2.104.0/25	10.2.104.1 – 10.2.104.126	10.2.104.127
210	10.2.104.128/25	10.2.104.129 – 10.2.104.254	10.2.104.255
211	10.2.105.0/25	10.2.105.1 – 10.2.105.126	10.2.105.127
212	10.2.105.128/25	10.2.105.129 – 10.2.105.254	10.2.105.255
213	10.2.106.0/25	10.2.106.1 – 10.2.106.126	10.2.106.127
214	10.2.106.128/25	10.2.106.129 – 10.2.106.254	10.2.106.255
215	10.2.107.0/25	10.2.107.1 – 10.2.107.126	10.2.107.127
216	10.2.107.128/25	10.2.107.129 – 10.2.107.254	10.2.107.255
217	10.2.108.0/25	10.2.108.1 – 10.2.108.126	10.2.108.127
218	10.2.108.128/25	10.2.108.129 – 10.2.108.254	10.2.108.255
219	10.2.109.0/25	10.2.109.1 – 10.2.109.126	10.2.109.127
220	10.2.109.128/25	10.2.109.129 – 10.2.109.254	10.2.109.255
221	10.2.110.0/25	10.2.110.1 – 10.2.110.126	10.2.110.127
222	10.2.110.128/25	10.2.110.129 – 10.2.110.254	10.2.110.255
223	10.2.111.0/25	10.2.111.1 – 10.2.111.126	10.2.111.127
224	10.2.111.128/25	10.2.111.129 – 10.2.111.254	10.2.111.255
225	10.2.112.0/25	10.2.112.1 – 10.2.112.126	10.2.112.127
226	10.2.112.128/25	10.2.112.129 – 10.2.112.254	10.2.112.255
227	10.2.113.0/25	10.2.113.1 – 10.2.113.126	10.2.113.127
228	10.2.113.128/25	10.2.113.129 – 10.2.113.254	10.2.113.255
229	10.2.114.0/25	10.2.114.1 – 10.2.114.126	10.2.114.127
230	10.2.114.128/25	10.2.114.129 – 10.2.114.254	10.2.114.255
231	10.2.115.0/25	10.2.115.1 – 10.2.115.126	10.2.115.127
232	10.2.115.128/25	10.2.115.129 – 10.2.115.254	10.2.115.255
233	10.2.116.0/25	10.2.116.1 – 10.2.116.126	10.2.116.127
234	10.2.116.128/25	10.2.116.129 – 10.2.116.254	10.2.116.255
235	10.2.117.0/25	10.2.117.1 – 10.2.117.126	10.2.117.127
236	10.2.117.128/25	10.2.117.129 – 10.2.117.254	10.2.117.255
237	10.2.118.0/25	10.2.118.1 – 10.2.118.126	10.2.118.127
238	10.2.118.128/25	10.2.118.129 – 10.2.118.254	10.2.118.255
239	10.2.119.0/25	10.2.119.1 – 10.2.119.126	10.2.119.127
240	10.2.119.128/25	10.2.119.129 – 10.2.119.254	10.2.119.255
241	10.2.120.0/25	10.2.120.1 – 10.2.120.126	10.2.120.127
242	10.2.120.128/25	10.2.120.129 – 10.2.120.254	10.2.120.255
243	10.2.121.0/25	10.2.121.1 – 10.2.121.126	10.2.121.127
244	10.2.121.128/25	10.2.121.129 – 10.2.121.254	10.2.121.255
245	10.2.122.0/25	10.2.122.1 – 10.2.122.126	10.2.122.127
246	10.2.122.128/25	10.2.122.129 – 10.2.122.254	10.2.122.255
247	10.2.123.0/25	10.2.123.1 – 10.2.123.126	10.2.123.127
248	10.2.123.128/25	10.2.123.129 – 10.2.123.254	10.2.123.255
249	10.2.124.0/25	10.2.124.1 – 10.2.124.126	10.2.124.127
250	10.2.124.128/25	10.2.124.129 – 10.2.124.254	10.2.124.255
251	10.2.125.0/25	10.2.125.1 – 10.2.125.126	10.2.125.127
252	10.2.125.128/25	10.2.125.129 – 10.2.125.254	10.2.125.255
253	10.2.126.0/25	10.2.126.1 – 10.2.126.126	10.2.126.127
254	10.2.126.128/25	10.2.126.129 – 10.2.126.254	10.2.126.255
255	10.2.127.0/25	10.2.127.1 – 10.2.127.126	10.2.127.127
256	10.2.127.128/25	10.2.127.129 – 10.2.127.254	10.2.127.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /17
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	1
/18	255.255.192.0	16,384	16,382	2 split →
/19	255.255.224.0	8,192	8,190	4 split →
/20	255.255.240.0	4,096	4,094	8 split →
/21	255.255.248.0	2,048	2,046	16 split →
/22	255.255.252.0	1,024	1,022	32 split →
/23	255.255.254.0	512	510	64 split →
/24	255.255.255.0	256	254	128 split →
/25	255.255.255.128	128	126	256 split →
/26	255.255.255.192	64	62	512 split →
/27	255.255.255.224	32	30	1,024 split →
/28	255.255.255.240	16	14	2,048 split →
/29	255.255.255.248	8	6	4,096 split →
/30	255.255.255.252	4	2	8,192 split →
/31	255.255.255.254	2	2	16,384 split →
/32	255.255.255.255	1	1	32,768 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →