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)10.0.0.0/8

network10.0.0.0/8

broadcast10.255.255.255

first host10.0.0.1

last host10.255.255.254

subnet mask255.0.0.0

wildcard0.255.255.255

addresses16,777,216

usable hosts16,777,214

classA

ipcalc 10.0.0.0/8

address00001010.00000000.00000000.00000000

subnet mask11111111.00000000.00000000.00000000

network00001010.00000000.00000000.00000000

broadcast00001010.11111111.11111111.11111111

green = network part, grey = host part

hex0x0a000000

decimal167772160

reverse dns0.0.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:0

/8 split into /25 · 131,072 subnets

close ×

#	network	host range	broadcast
1	10.0.0.0/25	10.0.0.1 – 10.0.0.126	10.0.0.127
2	10.0.0.128/25	10.0.0.129 – 10.0.0.254	10.0.0.255
3	10.0.1.0/25	10.0.1.1 – 10.0.1.126	10.0.1.127
4	10.0.1.128/25	10.0.1.129 – 10.0.1.254	10.0.1.255
5	10.0.2.0/25	10.0.2.1 – 10.0.2.126	10.0.2.127
6	10.0.2.128/25	10.0.2.129 – 10.0.2.254	10.0.2.255
7	10.0.3.0/25	10.0.3.1 – 10.0.3.126	10.0.3.127
8	10.0.3.128/25	10.0.3.129 – 10.0.3.254	10.0.3.255
9	10.0.4.0/25	10.0.4.1 – 10.0.4.126	10.0.4.127
10	10.0.4.128/25	10.0.4.129 – 10.0.4.254	10.0.4.255
11	10.0.5.0/25	10.0.5.1 – 10.0.5.126	10.0.5.127
12	10.0.5.128/25	10.0.5.129 – 10.0.5.254	10.0.5.255
13	10.0.6.0/25	10.0.6.1 – 10.0.6.126	10.0.6.127
14	10.0.6.128/25	10.0.6.129 – 10.0.6.254	10.0.6.255
15	10.0.7.0/25	10.0.7.1 – 10.0.7.126	10.0.7.127
16	10.0.7.128/25	10.0.7.129 – 10.0.7.254	10.0.7.255
17	10.0.8.0/25	10.0.8.1 – 10.0.8.126	10.0.8.127
18	10.0.8.128/25	10.0.8.129 – 10.0.8.254	10.0.8.255
19	10.0.9.0/25	10.0.9.1 – 10.0.9.126	10.0.9.127
20	10.0.9.128/25	10.0.9.129 – 10.0.9.254	10.0.9.255
21	10.0.10.0/25	10.0.10.1 – 10.0.10.126	10.0.10.127
22	10.0.10.128/25	10.0.10.129 – 10.0.10.254	10.0.10.255
23	10.0.11.0/25	10.0.11.1 – 10.0.11.126	10.0.11.127
24	10.0.11.128/25	10.0.11.129 – 10.0.11.254	10.0.11.255
25	10.0.12.0/25	10.0.12.1 – 10.0.12.126	10.0.12.127
26	10.0.12.128/25	10.0.12.129 – 10.0.12.254	10.0.12.255
27	10.0.13.0/25	10.0.13.1 – 10.0.13.126	10.0.13.127
28	10.0.13.128/25	10.0.13.129 – 10.0.13.254	10.0.13.255
29	10.0.14.0/25	10.0.14.1 – 10.0.14.126	10.0.14.127
30	10.0.14.128/25	10.0.14.129 – 10.0.14.254	10.0.14.255
31	10.0.15.0/25	10.0.15.1 – 10.0.15.126	10.0.15.127
32	10.0.15.128/25	10.0.15.129 – 10.0.15.254	10.0.15.255
33	10.0.16.0/25	10.0.16.1 – 10.0.16.126	10.0.16.127
34	10.0.16.128/25	10.0.16.129 – 10.0.16.254	10.0.16.255
35	10.0.17.0/25	10.0.17.1 – 10.0.17.126	10.0.17.127
36	10.0.17.128/25	10.0.17.129 – 10.0.17.254	10.0.17.255
37	10.0.18.0/25	10.0.18.1 – 10.0.18.126	10.0.18.127
38	10.0.18.128/25	10.0.18.129 – 10.0.18.254	10.0.18.255
39	10.0.19.0/25	10.0.19.1 – 10.0.19.126	10.0.19.127
40	10.0.19.128/25	10.0.19.129 – 10.0.19.254	10.0.19.255
41	10.0.20.0/25	10.0.20.1 – 10.0.20.126	10.0.20.127
42	10.0.20.128/25	10.0.20.129 – 10.0.20.254	10.0.20.255
43	10.0.21.0/25	10.0.21.1 – 10.0.21.126	10.0.21.127
44	10.0.21.128/25	10.0.21.129 – 10.0.21.254	10.0.21.255
45	10.0.22.0/25	10.0.22.1 – 10.0.22.126	10.0.22.127
46	10.0.22.128/25	10.0.22.129 – 10.0.22.254	10.0.22.255
47	10.0.23.0/25	10.0.23.1 – 10.0.23.126	10.0.23.127
48	10.0.23.128/25	10.0.23.129 – 10.0.23.254	10.0.23.255
49	10.0.24.0/25	10.0.24.1 – 10.0.24.126	10.0.24.127
50	10.0.24.128/25	10.0.24.129 – 10.0.24.254	10.0.24.255
51	10.0.25.0/25	10.0.25.1 – 10.0.25.126	10.0.25.127
52	10.0.25.128/25	10.0.25.129 – 10.0.25.254	10.0.25.255
53	10.0.26.0/25	10.0.26.1 – 10.0.26.126	10.0.26.127
54	10.0.26.128/25	10.0.26.129 – 10.0.26.254	10.0.26.255
55	10.0.27.0/25	10.0.27.1 – 10.0.27.126	10.0.27.127
56	10.0.27.128/25	10.0.27.129 – 10.0.27.254	10.0.27.255
57	10.0.28.0/25	10.0.28.1 – 10.0.28.126	10.0.28.127
58	10.0.28.128/25	10.0.28.129 – 10.0.28.254	10.0.28.255
59	10.0.29.0/25	10.0.29.1 – 10.0.29.126	10.0.29.127
60	10.0.29.128/25	10.0.29.129 – 10.0.29.254	10.0.29.255
61	10.0.30.0/25	10.0.30.1 – 10.0.30.126	10.0.30.127
62	10.0.30.128/25	10.0.30.129 – 10.0.30.254	10.0.30.255
63	10.0.31.0/25	10.0.31.1 – 10.0.31.126	10.0.31.127
64	10.0.31.128/25	10.0.31.129 – 10.0.31.254	10.0.31.255
65	10.0.32.0/25	10.0.32.1 – 10.0.32.126	10.0.32.127
66	10.0.32.128/25	10.0.32.129 – 10.0.32.254	10.0.32.255
67	10.0.33.0/25	10.0.33.1 – 10.0.33.126	10.0.33.127
68	10.0.33.128/25	10.0.33.129 – 10.0.33.254	10.0.33.255
69	10.0.34.0/25	10.0.34.1 – 10.0.34.126	10.0.34.127
70	10.0.34.128/25	10.0.34.129 – 10.0.34.254	10.0.34.255
71	10.0.35.0/25	10.0.35.1 – 10.0.35.126	10.0.35.127
72	10.0.35.128/25	10.0.35.129 – 10.0.35.254	10.0.35.255
73	10.0.36.0/25	10.0.36.1 – 10.0.36.126	10.0.36.127
74	10.0.36.128/25	10.0.36.129 – 10.0.36.254	10.0.36.255
75	10.0.37.0/25	10.0.37.1 – 10.0.37.126	10.0.37.127
76	10.0.37.128/25	10.0.37.129 – 10.0.37.254	10.0.37.255
77	10.0.38.0/25	10.0.38.1 – 10.0.38.126	10.0.38.127
78	10.0.38.128/25	10.0.38.129 – 10.0.38.254	10.0.38.255
79	10.0.39.0/25	10.0.39.1 – 10.0.39.126	10.0.39.127
80	10.0.39.128/25	10.0.39.129 – 10.0.39.254	10.0.39.255
81	10.0.40.0/25	10.0.40.1 – 10.0.40.126	10.0.40.127
82	10.0.40.128/25	10.0.40.129 – 10.0.40.254	10.0.40.255
83	10.0.41.0/25	10.0.41.1 – 10.0.41.126	10.0.41.127
84	10.0.41.128/25	10.0.41.129 – 10.0.41.254	10.0.41.255
85	10.0.42.0/25	10.0.42.1 – 10.0.42.126	10.0.42.127
86	10.0.42.128/25	10.0.42.129 – 10.0.42.254	10.0.42.255
87	10.0.43.0/25	10.0.43.1 – 10.0.43.126	10.0.43.127
88	10.0.43.128/25	10.0.43.129 – 10.0.43.254	10.0.43.255
89	10.0.44.0/25	10.0.44.1 – 10.0.44.126	10.0.44.127
90	10.0.44.128/25	10.0.44.129 – 10.0.44.254	10.0.44.255
91	10.0.45.0/25	10.0.45.1 – 10.0.45.126	10.0.45.127
92	10.0.45.128/25	10.0.45.129 – 10.0.45.254	10.0.45.255
93	10.0.46.0/25	10.0.46.1 – 10.0.46.126	10.0.46.127
94	10.0.46.128/25	10.0.46.129 – 10.0.46.254	10.0.46.255
95	10.0.47.0/25	10.0.47.1 – 10.0.47.126	10.0.47.127
96	10.0.47.128/25	10.0.47.129 – 10.0.47.254	10.0.47.255
97	10.0.48.0/25	10.0.48.1 – 10.0.48.126	10.0.48.127
98	10.0.48.128/25	10.0.48.129 – 10.0.48.254	10.0.48.255
99	10.0.49.0/25	10.0.49.1 – 10.0.49.126	10.0.49.127
100	10.0.49.128/25	10.0.49.129 – 10.0.49.254	10.0.49.255
101	10.0.50.0/25	10.0.50.1 – 10.0.50.126	10.0.50.127
102	10.0.50.128/25	10.0.50.129 – 10.0.50.254	10.0.50.255
103	10.0.51.0/25	10.0.51.1 – 10.0.51.126	10.0.51.127
104	10.0.51.128/25	10.0.51.129 – 10.0.51.254	10.0.51.255
105	10.0.52.0/25	10.0.52.1 – 10.0.52.126	10.0.52.127
106	10.0.52.128/25	10.0.52.129 – 10.0.52.254	10.0.52.255
107	10.0.53.0/25	10.0.53.1 – 10.0.53.126	10.0.53.127
108	10.0.53.128/25	10.0.53.129 – 10.0.53.254	10.0.53.255
109	10.0.54.0/25	10.0.54.1 – 10.0.54.126	10.0.54.127
110	10.0.54.128/25	10.0.54.129 – 10.0.54.254	10.0.54.255
111	10.0.55.0/25	10.0.55.1 – 10.0.55.126	10.0.55.127
112	10.0.55.128/25	10.0.55.129 – 10.0.55.254	10.0.55.255
113	10.0.56.0/25	10.0.56.1 – 10.0.56.126	10.0.56.127
114	10.0.56.128/25	10.0.56.129 – 10.0.56.254	10.0.56.255
115	10.0.57.0/25	10.0.57.1 – 10.0.57.126	10.0.57.127
116	10.0.57.128/25	10.0.57.129 – 10.0.57.254	10.0.57.255
117	10.0.58.0/25	10.0.58.1 – 10.0.58.126	10.0.58.127
118	10.0.58.128/25	10.0.58.129 – 10.0.58.254	10.0.58.255
119	10.0.59.0/25	10.0.59.1 – 10.0.59.126	10.0.59.127
120	10.0.59.128/25	10.0.59.129 – 10.0.59.254	10.0.59.255
121	10.0.60.0/25	10.0.60.1 – 10.0.60.126	10.0.60.127
122	10.0.60.128/25	10.0.60.129 – 10.0.60.254	10.0.60.255
123	10.0.61.0/25	10.0.61.1 – 10.0.61.126	10.0.61.127
124	10.0.61.128/25	10.0.61.129 – 10.0.61.254	10.0.61.255
125	10.0.62.0/25	10.0.62.1 – 10.0.62.126	10.0.62.127
126	10.0.62.128/25	10.0.62.129 – 10.0.62.254	10.0.62.255
127	10.0.63.0/25	10.0.63.1 – 10.0.63.126	10.0.63.127
128	10.0.63.128/25	10.0.63.129 – 10.0.63.254	10.0.63.255
129	10.0.64.0/25	10.0.64.1 – 10.0.64.126	10.0.64.127
130	10.0.64.128/25	10.0.64.129 – 10.0.64.254	10.0.64.255
131	10.0.65.0/25	10.0.65.1 – 10.0.65.126	10.0.65.127
132	10.0.65.128/25	10.0.65.129 – 10.0.65.254	10.0.65.255
133	10.0.66.0/25	10.0.66.1 – 10.0.66.126	10.0.66.127
134	10.0.66.128/25	10.0.66.129 – 10.0.66.254	10.0.66.255
135	10.0.67.0/25	10.0.67.1 – 10.0.67.126	10.0.67.127
136	10.0.67.128/25	10.0.67.129 – 10.0.67.254	10.0.67.255
137	10.0.68.0/25	10.0.68.1 – 10.0.68.126	10.0.68.127
138	10.0.68.128/25	10.0.68.129 – 10.0.68.254	10.0.68.255
139	10.0.69.0/25	10.0.69.1 – 10.0.69.126	10.0.69.127
140	10.0.69.128/25	10.0.69.129 – 10.0.69.254	10.0.69.255
141	10.0.70.0/25	10.0.70.1 – 10.0.70.126	10.0.70.127
142	10.0.70.128/25	10.0.70.129 – 10.0.70.254	10.0.70.255
143	10.0.71.0/25	10.0.71.1 – 10.0.71.126	10.0.71.127
144	10.0.71.128/25	10.0.71.129 – 10.0.71.254	10.0.71.255
145	10.0.72.0/25	10.0.72.1 – 10.0.72.126	10.0.72.127
146	10.0.72.128/25	10.0.72.129 – 10.0.72.254	10.0.72.255
147	10.0.73.0/25	10.0.73.1 – 10.0.73.126	10.0.73.127
148	10.0.73.128/25	10.0.73.129 – 10.0.73.254	10.0.73.255
149	10.0.74.0/25	10.0.74.1 – 10.0.74.126	10.0.74.127
150	10.0.74.128/25	10.0.74.129 – 10.0.74.254	10.0.74.255
151	10.0.75.0/25	10.0.75.1 – 10.0.75.126	10.0.75.127
152	10.0.75.128/25	10.0.75.129 – 10.0.75.254	10.0.75.255
153	10.0.76.0/25	10.0.76.1 – 10.0.76.126	10.0.76.127
154	10.0.76.128/25	10.0.76.129 – 10.0.76.254	10.0.76.255
155	10.0.77.0/25	10.0.77.1 – 10.0.77.126	10.0.77.127
156	10.0.77.128/25	10.0.77.129 – 10.0.77.254	10.0.77.255
157	10.0.78.0/25	10.0.78.1 – 10.0.78.126	10.0.78.127
158	10.0.78.128/25	10.0.78.129 – 10.0.78.254	10.0.78.255
159	10.0.79.0/25	10.0.79.1 – 10.0.79.126	10.0.79.127
160	10.0.79.128/25	10.0.79.129 – 10.0.79.254	10.0.79.255
161	10.0.80.0/25	10.0.80.1 – 10.0.80.126	10.0.80.127
162	10.0.80.128/25	10.0.80.129 – 10.0.80.254	10.0.80.255
163	10.0.81.0/25	10.0.81.1 – 10.0.81.126	10.0.81.127
164	10.0.81.128/25	10.0.81.129 – 10.0.81.254	10.0.81.255
165	10.0.82.0/25	10.0.82.1 – 10.0.82.126	10.0.82.127
166	10.0.82.128/25	10.0.82.129 – 10.0.82.254	10.0.82.255
167	10.0.83.0/25	10.0.83.1 – 10.0.83.126	10.0.83.127
168	10.0.83.128/25	10.0.83.129 – 10.0.83.254	10.0.83.255
169	10.0.84.0/25	10.0.84.1 – 10.0.84.126	10.0.84.127
170	10.0.84.128/25	10.0.84.129 – 10.0.84.254	10.0.84.255
171	10.0.85.0/25	10.0.85.1 – 10.0.85.126	10.0.85.127
172	10.0.85.128/25	10.0.85.129 – 10.0.85.254	10.0.85.255
173	10.0.86.0/25	10.0.86.1 – 10.0.86.126	10.0.86.127
174	10.0.86.128/25	10.0.86.129 – 10.0.86.254	10.0.86.255
175	10.0.87.0/25	10.0.87.1 – 10.0.87.126	10.0.87.127
176	10.0.87.128/25	10.0.87.129 – 10.0.87.254	10.0.87.255
177	10.0.88.0/25	10.0.88.1 – 10.0.88.126	10.0.88.127
178	10.0.88.128/25	10.0.88.129 – 10.0.88.254	10.0.88.255
179	10.0.89.0/25	10.0.89.1 – 10.0.89.126	10.0.89.127
180	10.0.89.128/25	10.0.89.129 – 10.0.89.254	10.0.89.255
181	10.0.90.0/25	10.0.90.1 – 10.0.90.126	10.0.90.127
182	10.0.90.128/25	10.0.90.129 – 10.0.90.254	10.0.90.255
183	10.0.91.0/25	10.0.91.1 – 10.0.91.126	10.0.91.127
184	10.0.91.128/25	10.0.91.129 – 10.0.91.254	10.0.91.255
185	10.0.92.0/25	10.0.92.1 – 10.0.92.126	10.0.92.127
186	10.0.92.128/25	10.0.92.129 – 10.0.92.254	10.0.92.255
187	10.0.93.0/25	10.0.93.1 – 10.0.93.126	10.0.93.127
188	10.0.93.128/25	10.0.93.129 – 10.0.93.254	10.0.93.255
189	10.0.94.0/25	10.0.94.1 – 10.0.94.126	10.0.94.127
190	10.0.94.128/25	10.0.94.129 – 10.0.94.254	10.0.94.255
191	10.0.95.0/25	10.0.95.1 – 10.0.95.126	10.0.95.127
192	10.0.95.128/25	10.0.95.129 – 10.0.95.254	10.0.95.255
193	10.0.96.0/25	10.0.96.1 – 10.0.96.126	10.0.96.127
194	10.0.96.128/25	10.0.96.129 – 10.0.96.254	10.0.96.255
195	10.0.97.0/25	10.0.97.1 – 10.0.97.126	10.0.97.127
196	10.0.97.128/25	10.0.97.129 – 10.0.97.254	10.0.97.255
197	10.0.98.0/25	10.0.98.1 – 10.0.98.126	10.0.98.127
198	10.0.98.128/25	10.0.98.129 – 10.0.98.254	10.0.98.255
199	10.0.99.0/25	10.0.99.1 – 10.0.99.126	10.0.99.127
200	10.0.99.128/25	10.0.99.129 – 10.0.99.254	10.0.99.255
201	10.0.100.0/25	10.0.100.1 – 10.0.100.126	10.0.100.127
202	10.0.100.128/25	10.0.100.129 – 10.0.100.254	10.0.100.255
203	10.0.101.0/25	10.0.101.1 – 10.0.101.126	10.0.101.127
204	10.0.101.128/25	10.0.101.129 – 10.0.101.254	10.0.101.255
205	10.0.102.0/25	10.0.102.1 – 10.0.102.126	10.0.102.127
206	10.0.102.128/25	10.0.102.129 – 10.0.102.254	10.0.102.255
207	10.0.103.0/25	10.0.103.1 – 10.0.103.126	10.0.103.127
208	10.0.103.128/25	10.0.103.129 – 10.0.103.254	10.0.103.255
209	10.0.104.0/25	10.0.104.1 – 10.0.104.126	10.0.104.127
210	10.0.104.128/25	10.0.104.129 – 10.0.104.254	10.0.104.255
211	10.0.105.0/25	10.0.105.1 – 10.0.105.126	10.0.105.127
212	10.0.105.128/25	10.0.105.129 – 10.0.105.254	10.0.105.255
213	10.0.106.0/25	10.0.106.1 – 10.0.106.126	10.0.106.127
214	10.0.106.128/25	10.0.106.129 – 10.0.106.254	10.0.106.255
215	10.0.107.0/25	10.0.107.1 – 10.0.107.126	10.0.107.127
216	10.0.107.128/25	10.0.107.129 – 10.0.107.254	10.0.107.255
217	10.0.108.0/25	10.0.108.1 – 10.0.108.126	10.0.108.127
218	10.0.108.128/25	10.0.108.129 – 10.0.108.254	10.0.108.255
219	10.0.109.0/25	10.0.109.1 – 10.0.109.126	10.0.109.127
220	10.0.109.128/25	10.0.109.129 – 10.0.109.254	10.0.109.255
221	10.0.110.0/25	10.0.110.1 – 10.0.110.126	10.0.110.127
222	10.0.110.128/25	10.0.110.129 – 10.0.110.254	10.0.110.255
223	10.0.111.0/25	10.0.111.1 – 10.0.111.126	10.0.111.127
224	10.0.111.128/25	10.0.111.129 – 10.0.111.254	10.0.111.255
225	10.0.112.0/25	10.0.112.1 – 10.0.112.126	10.0.112.127
226	10.0.112.128/25	10.0.112.129 – 10.0.112.254	10.0.112.255
227	10.0.113.0/25	10.0.113.1 – 10.0.113.126	10.0.113.127
228	10.0.113.128/25	10.0.113.129 – 10.0.113.254	10.0.113.255
229	10.0.114.0/25	10.0.114.1 – 10.0.114.126	10.0.114.127
230	10.0.114.128/25	10.0.114.129 – 10.0.114.254	10.0.114.255
231	10.0.115.0/25	10.0.115.1 – 10.0.115.126	10.0.115.127
232	10.0.115.128/25	10.0.115.129 – 10.0.115.254	10.0.115.255
233	10.0.116.0/25	10.0.116.1 – 10.0.116.126	10.0.116.127
234	10.0.116.128/25	10.0.116.129 – 10.0.116.254	10.0.116.255
235	10.0.117.0/25	10.0.117.1 – 10.0.117.126	10.0.117.127
236	10.0.117.128/25	10.0.117.129 – 10.0.117.254	10.0.117.255
237	10.0.118.0/25	10.0.118.1 – 10.0.118.126	10.0.118.127
238	10.0.118.128/25	10.0.118.129 – 10.0.118.254	10.0.118.255
239	10.0.119.0/25	10.0.119.1 – 10.0.119.126	10.0.119.127
240	10.0.119.128/25	10.0.119.129 – 10.0.119.254	10.0.119.255
241	10.0.120.0/25	10.0.120.1 – 10.0.120.126	10.0.120.127
242	10.0.120.128/25	10.0.120.129 – 10.0.120.254	10.0.120.255
243	10.0.121.0/25	10.0.121.1 – 10.0.121.126	10.0.121.127
244	10.0.121.128/25	10.0.121.129 – 10.0.121.254	10.0.121.255
245	10.0.122.0/25	10.0.122.1 – 10.0.122.126	10.0.122.127
246	10.0.122.128/25	10.0.122.129 – 10.0.122.254	10.0.122.255
247	10.0.123.0/25	10.0.123.1 – 10.0.123.126	10.0.123.127
248	10.0.123.128/25	10.0.123.129 – 10.0.123.254	10.0.123.255
249	10.0.124.0/25	10.0.124.1 – 10.0.124.126	10.0.124.127
250	10.0.124.128/25	10.0.124.129 – 10.0.124.254	10.0.124.255
251	10.0.125.0/25	10.0.125.1 – 10.0.125.126	10.0.125.127
252	10.0.125.128/25	10.0.125.129 – 10.0.125.254	10.0.125.255
253	10.0.126.0/25	10.0.126.1 – 10.0.126.126	10.0.126.127
254	10.0.126.128/25	10.0.126.129 – 10.0.126.254	10.0.126.255
255	10.0.127.0/25	10.0.127.1 – 10.0.127.126	10.0.127.127
256	10.0.127.128/25	10.0.127.129 – 10.0.127.254	10.0.127.255

showing 256 of 131,072

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 /8
/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	1
/9	255.128.0.0	8,388,608	8,388,606	2 split →
/10	255.192.0.0	4,194,304	4,194,302	4 split →
/11	255.224.0.0	2,097,152	2,097,150	8 split →
/12	255.240.0.0	1,048,576	1,048,574	16 split →
/13	255.248.0.0	524,288	524,286	32 split →
/14	255.252.0.0	262,144	262,142	64 split →
/15	255.254.0.0	131,072	131,070	128 split →
/16	255.255.0.0	65,536	65,534	256 split →
/17	255.255.128.0	32,768	32,766	512 split →
/18	255.255.192.0	16,384	16,382	1,024 split →
/19	255.255.224.0	8,192	8,190	2,048 split →
/20	255.255.240.0	4,096	4,094	4,096 split →
/21	255.255.248.0	2,048	2,046	8,192 split →
/22	255.255.252.0	1,024	1,022	16,384 split →
/23	255.255.254.0	512	510	32,768 split →
/24	255.255.255.0	256	254	65,536 split →
/25	255.255.255.128	128	126	131,072 split →
/26	255.255.255.192	64	62	262,144 split →
/27	255.255.255.224	32	30	524,288 split →
/28	255.255.255.240	16	14	1,048,576 split →
/29	255.255.255.248	8	6	2,097,152 split →
/30	255.255.255.252	4	2	4,194,304 split →
/31	255.255.255.254	2	2	8,388,608 split →
/32	255.255.255.255	1	1	16,777,216 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 →