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)10.2.0.0/18

network10.2.0.0/18

broadcast10.2.63.255

first host10.2.0.1

last host10.2.63.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.2.0.0/18

address00001010.00000010.00000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00000010.00000000.00000000

broadcast00001010.00000010.00111111.11111111

green = network part, grey = host part

hex0x0a020000

decimal167903232

reverse dns0.0.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:0

/18 split into /26 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.0.0/26	10.2.0.1 – 10.2.0.62	10.2.0.63
2	10.2.0.64/26	10.2.0.65 – 10.2.0.126	10.2.0.127
3	10.2.0.128/26	10.2.0.129 – 10.2.0.190	10.2.0.191
4	10.2.0.192/26	10.2.0.193 – 10.2.0.254	10.2.0.255
5	10.2.1.0/26	10.2.1.1 – 10.2.1.62	10.2.1.63
6	10.2.1.64/26	10.2.1.65 – 10.2.1.126	10.2.1.127
7	10.2.1.128/26	10.2.1.129 – 10.2.1.190	10.2.1.191
8	10.2.1.192/26	10.2.1.193 – 10.2.1.254	10.2.1.255
9	10.2.2.0/26	10.2.2.1 – 10.2.2.62	10.2.2.63
10	10.2.2.64/26	10.2.2.65 – 10.2.2.126	10.2.2.127
11	10.2.2.128/26	10.2.2.129 – 10.2.2.190	10.2.2.191
12	10.2.2.192/26	10.2.2.193 – 10.2.2.254	10.2.2.255
13	10.2.3.0/26	10.2.3.1 – 10.2.3.62	10.2.3.63
14	10.2.3.64/26	10.2.3.65 – 10.2.3.126	10.2.3.127
15	10.2.3.128/26	10.2.3.129 – 10.2.3.190	10.2.3.191
16	10.2.3.192/26	10.2.3.193 – 10.2.3.254	10.2.3.255
17	10.2.4.0/26	10.2.4.1 – 10.2.4.62	10.2.4.63
18	10.2.4.64/26	10.2.4.65 – 10.2.4.126	10.2.4.127
19	10.2.4.128/26	10.2.4.129 – 10.2.4.190	10.2.4.191
20	10.2.4.192/26	10.2.4.193 – 10.2.4.254	10.2.4.255
21	10.2.5.0/26	10.2.5.1 – 10.2.5.62	10.2.5.63
22	10.2.5.64/26	10.2.5.65 – 10.2.5.126	10.2.5.127
23	10.2.5.128/26	10.2.5.129 – 10.2.5.190	10.2.5.191
24	10.2.5.192/26	10.2.5.193 – 10.2.5.254	10.2.5.255
25	10.2.6.0/26	10.2.6.1 – 10.2.6.62	10.2.6.63
26	10.2.6.64/26	10.2.6.65 – 10.2.6.126	10.2.6.127
27	10.2.6.128/26	10.2.6.129 – 10.2.6.190	10.2.6.191
28	10.2.6.192/26	10.2.6.193 – 10.2.6.254	10.2.6.255
29	10.2.7.0/26	10.2.7.1 – 10.2.7.62	10.2.7.63
30	10.2.7.64/26	10.2.7.65 – 10.2.7.126	10.2.7.127
31	10.2.7.128/26	10.2.7.129 – 10.2.7.190	10.2.7.191
32	10.2.7.192/26	10.2.7.193 – 10.2.7.254	10.2.7.255
33	10.2.8.0/26	10.2.8.1 – 10.2.8.62	10.2.8.63
34	10.2.8.64/26	10.2.8.65 – 10.2.8.126	10.2.8.127
35	10.2.8.128/26	10.2.8.129 – 10.2.8.190	10.2.8.191
36	10.2.8.192/26	10.2.8.193 – 10.2.8.254	10.2.8.255
37	10.2.9.0/26	10.2.9.1 – 10.2.9.62	10.2.9.63
38	10.2.9.64/26	10.2.9.65 – 10.2.9.126	10.2.9.127
39	10.2.9.128/26	10.2.9.129 – 10.2.9.190	10.2.9.191
40	10.2.9.192/26	10.2.9.193 – 10.2.9.254	10.2.9.255
41	10.2.10.0/26	10.2.10.1 – 10.2.10.62	10.2.10.63
42	10.2.10.64/26	10.2.10.65 – 10.2.10.126	10.2.10.127
43	10.2.10.128/26	10.2.10.129 – 10.2.10.190	10.2.10.191
44	10.2.10.192/26	10.2.10.193 – 10.2.10.254	10.2.10.255
45	10.2.11.0/26	10.2.11.1 – 10.2.11.62	10.2.11.63
46	10.2.11.64/26	10.2.11.65 – 10.2.11.126	10.2.11.127
47	10.2.11.128/26	10.2.11.129 – 10.2.11.190	10.2.11.191
48	10.2.11.192/26	10.2.11.193 – 10.2.11.254	10.2.11.255
49	10.2.12.0/26	10.2.12.1 – 10.2.12.62	10.2.12.63
50	10.2.12.64/26	10.2.12.65 – 10.2.12.126	10.2.12.127
51	10.2.12.128/26	10.2.12.129 – 10.2.12.190	10.2.12.191
52	10.2.12.192/26	10.2.12.193 – 10.2.12.254	10.2.12.255
53	10.2.13.0/26	10.2.13.1 – 10.2.13.62	10.2.13.63
54	10.2.13.64/26	10.2.13.65 – 10.2.13.126	10.2.13.127
55	10.2.13.128/26	10.2.13.129 – 10.2.13.190	10.2.13.191
56	10.2.13.192/26	10.2.13.193 – 10.2.13.254	10.2.13.255
57	10.2.14.0/26	10.2.14.1 – 10.2.14.62	10.2.14.63
58	10.2.14.64/26	10.2.14.65 – 10.2.14.126	10.2.14.127
59	10.2.14.128/26	10.2.14.129 – 10.2.14.190	10.2.14.191
60	10.2.14.192/26	10.2.14.193 – 10.2.14.254	10.2.14.255
61	10.2.15.0/26	10.2.15.1 – 10.2.15.62	10.2.15.63
62	10.2.15.64/26	10.2.15.65 – 10.2.15.126	10.2.15.127
63	10.2.15.128/26	10.2.15.129 – 10.2.15.190	10.2.15.191
64	10.2.15.192/26	10.2.15.193 – 10.2.15.254	10.2.15.255
65	10.2.16.0/26	10.2.16.1 – 10.2.16.62	10.2.16.63
66	10.2.16.64/26	10.2.16.65 – 10.2.16.126	10.2.16.127
67	10.2.16.128/26	10.2.16.129 – 10.2.16.190	10.2.16.191
68	10.2.16.192/26	10.2.16.193 – 10.2.16.254	10.2.16.255
69	10.2.17.0/26	10.2.17.1 – 10.2.17.62	10.2.17.63
70	10.2.17.64/26	10.2.17.65 – 10.2.17.126	10.2.17.127
71	10.2.17.128/26	10.2.17.129 – 10.2.17.190	10.2.17.191
72	10.2.17.192/26	10.2.17.193 – 10.2.17.254	10.2.17.255
73	10.2.18.0/26	10.2.18.1 – 10.2.18.62	10.2.18.63
74	10.2.18.64/26	10.2.18.65 – 10.2.18.126	10.2.18.127
75	10.2.18.128/26	10.2.18.129 – 10.2.18.190	10.2.18.191
76	10.2.18.192/26	10.2.18.193 – 10.2.18.254	10.2.18.255
77	10.2.19.0/26	10.2.19.1 – 10.2.19.62	10.2.19.63
78	10.2.19.64/26	10.2.19.65 – 10.2.19.126	10.2.19.127
79	10.2.19.128/26	10.2.19.129 – 10.2.19.190	10.2.19.191
80	10.2.19.192/26	10.2.19.193 – 10.2.19.254	10.2.19.255
81	10.2.20.0/26	10.2.20.1 – 10.2.20.62	10.2.20.63
82	10.2.20.64/26	10.2.20.65 – 10.2.20.126	10.2.20.127
83	10.2.20.128/26	10.2.20.129 – 10.2.20.190	10.2.20.191
84	10.2.20.192/26	10.2.20.193 – 10.2.20.254	10.2.20.255
85	10.2.21.0/26	10.2.21.1 – 10.2.21.62	10.2.21.63
86	10.2.21.64/26	10.2.21.65 – 10.2.21.126	10.2.21.127
87	10.2.21.128/26	10.2.21.129 – 10.2.21.190	10.2.21.191
88	10.2.21.192/26	10.2.21.193 – 10.2.21.254	10.2.21.255
89	10.2.22.0/26	10.2.22.1 – 10.2.22.62	10.2.22.63
90	10.2.22.64/26	10.2.22.65 – 10.2.22.126	10.2.22.127
91	10.2.22.128/26	10.2.22.129 – 10.2.22.190	10.2.22.191
92	10.2.22.192/26	10.2.22.193 – 10.2.22.254	10.2.22.255
93	10.2.23.0/26	10.2.23.1 – 10.2.23.62	10.2.23.63
94	10.2.23.64/26	10.2.23.65 – 10.2.23.126	10.2.23.127
95	10.2.23.128/26	10.2.23.129 – 10.2.23.190	10.2.23.191
96	10.2.23.192/26	10.2.23.193 – 10.2.23.254	10.2.23.255
97	10.2.24.0/26	10.2.24.1 – 10.2.24.62	10.2.24.63
98	10.2.24.64/26	10.2.24.65 – 10.2.24.126	10.2.24.127
99	10.2.24.128/26	10.2.24.129 – 10.2.24.190	10.2.24.191
100	10.2.24.192/26	10.2.24.193 – 10.2.24.254	10.2.24.255
101	10.2.25.0/26	10.2.25.1 – 10.2.25.62	10.2.25.63
102	10.2.25.64/26	10.2.25.65 – 10.2.25.126	10.2.25.127
103	10.2.25.128/26	10.2.25.129 – 10.2.25.190	10.2.25.191
104	10.2.25.192/26	10.2.25.193 – 10.2.25.254	10.2.25.255
105	10.2.26.0/26	10.2.26.1 – 10.2.26.62	10.2.26.63
106	10.2.26.64/26	10.2.26.65 – 10.2.26.126	10.2.26.127
107	10.2.26.128/26	10.2.26.129 – 10.2.26.190	10.2.26.191
108	10.2.26.192/26	10.2.26.193 – 10.2.26.254	10.2.26.255
109	10.2.27.0/26	10.2.27.1 – 10.2.27.62	10.2.27.63
110	10.2.27.64/26	10.2.27.65 – 10.2.27.126	10.2.27.127
111	10.2.27.128/26	10.2.27.129 – 10.2.27.190	10.2.27.191
112	10.2.27.192/26	10.2.27.193 – 10.2.27.254	10.2.27.255
113	10.2.28.0/26	10.2.28.1 – 10.2.28.62	10.2.28.63
114	10.2.28.64/26	10.2.28.65 – 10.2.28.126	10.2.28.127
115	10.2.28.128/26	10.2.28.129 – 10.2.28.190	10.2.28.191
116	10.2.28.192/26	10.2.28.193 – 10.2.28.254	10.2.28.255
117	10.2.29.0/26	10.2.29.1 – 10.2.29.62	10.2.29.63
118	10.2.29.64/26	10.2.29.65 – 10.2.29.126	10.2.29.127
119	10.2.29.128/26	10.2.29.129 – 10.2.29.190	10.2.29.191
120	10.2.29.192/26	10.2.29.193 – 10.2.29.254	10.2.29.255
121	10.2.30.0/26	10.2.30.1 – 10.2.30.62	10.2.30.63
122	10.2.30.64/26	10.2.30.65 – 10.2.30.126	10.2.30.127
123	10.2.30.128/26	10.2.30.129 – 10.2.30.190	10.2.30.191
124	10.2.30.192/26	10.2.30.193 – 10.2.30.254	10.2.30.255
125	10.2.31.0/26	10.2.31.1 – 10.2.31.62	10.2.31.63
126	10.2.31.64/26	10.2.31.65 – 10.2.31.126	10.2.31.127
127	10.2.31.128/26	10.2.31.129 – 10.2.31.190	10.2.31.191
128	10.2.31.192/26	10.2.31.193 – 10.2.31.254	10.2.31.255
129	10.2.32.0/26	10.2.32.1 – 10.2.32.62	10.2.32.63
130	10.2.32.64/26	10.2.32.65 – 10.2.32.126	10.2.32.127
131	10.2.32.128/26	10.2.32.129 – 10.2.32.190	10.2.32.191
132	10.2.32.192/26	10.2.32.193 – 10.2.32.254	10.2.32.255
133	10.2.33.0/26	10.2.33.1 – 10.2.33.62	10.2.33.63
134	10.2.33.64/26	10.2.33.65 – 10.2.33.126	10.2.33.127
135	10.2.33.128/26	10.2.33.129 – 10.2.33.190	10.2.33.191
136	10.2.33.192/26	10.2.33.193 – 10.2.33.254	10.2.33.255
137	10.2.34.0/26	10.2.34.1 – 10.2.34.62	10.2.34.63
138	10.2.34.64/26	10.2.34.65 – 10.2.34.126	10.2.34.127
139	10.2.34.128/26	10.2.34.129 – 10.2.34.190	10.2.34.191
140	10.2.34.192/26	10.2.34.193 – 10.2.34.254	10.2.34.255
141	10.2.35.0/26	10.2.35.1 – 10.2.35.62	10.2.35.63
142	10.2.35.64/26	10.2.35.65 – 10.2.35.126	10.2.35.127
143	10.2.35.128/26	10.2.35.129 – 10.2.35.190	10.2.35.191
144	10.2.35.192/26	10.2.35.193 – 10.2.35.254	10.2.35.255
145	10.2.36.0/26	10.2.36.1 – 10.2.36.62	10.2.36.63
146	10.2.36.64/26	10.2.36.65 – 10.2.36.126	10.2.36.127
147	10.2.36.128/26	10.2.36.129 – 10.2.36.190	10.2.36.191
148	10.2.36.192/26	10.2.36.193 – 10.2.36.254	10.2.36.255
149	10.2.37.0/26	10.2.37.1 – 10.2.37.62	10.2.37.63
150	10.2.37.64/26	10.2.37.65 – 10.2.37.126	10.2.37.127
151	10.2.37.128/26	10.2.37.129 – 10.2.37.190	10.2.37.191
152	10.2.37.192/26	10.2.37.193 – 10.2.37.254	10.2.37.255
153	10.2.38.0/26	10.2.38.1 – 10.2.38.62	10.2.38.63
154	10.2.38.64/26	10.2.38.65 – 10.2.38.126	10.2.38.127
155	10.2.38.128/26	10.2.38.129 – 10.2.38.190	10.2.38.191
156	10.2.38.192/26	10.2.38.193 – 10.2.38.254	10.2.38.255
157	10.2.39.0/26	10.2.39.1 – 10.2.39.62	10.2.39.63
158	10.2.39.64/26	10.2.39.65 – 10.2.39.126	10.2.39.127
159	10.2.39.128/26	10.2.39.129 – 10.2.39.190	10.2.39.191
160	10.2.39.192/26	10.2.39.193 – 10.2.39.254	10.2.39.255
161	10.2.40.0/26	10.2.40.1 – 10.2.40.62	10.2.40.63
162	10.2.40.64/26	10.2.40.65 – 10.2.40.126	10.2.40.127
163	10.2.40.128/26	10.2.40.129 – 10.2.40.190	10.2.40.191
164	10.2.40.192/26	10.2.40.193 – 10.2.40.254	10.2.40.255
165	10.2.41.0/26	10.2.41.1 – 10.2.41.62	10.2.41.63
166	10.2.41.64/26	10.2.41.65 – 10.2.41.126	10.2.41.127
167	10.2.41.128/26	10.2.41.129 – 10.2.41.190	10.2.41.191
168	10.2.41.192/26	10.2.41.193 – 10.2.41.254	10.2.41.255
169	10.2.42.0/26	10.2.42.1 – 10.2.42.62	10.2.42.63
170	10.2.42.64/26	10.2.42.65 – 10.2.42.126	10.2.42.127
171	10.2.42.128/26	10.2.42.129 – 10.2.42.190	10.2.42.191
172	10.2.42.192/26	10.2.42.193 – 10.2.42.254	10.2.42.255
173	10.2.43.0/26	10.2.43.1 – 10.2.43.62	10.2.43.63
174	10.2.43.64/26	10.2.43.65 – 10.2.43.126	10.2.43.127
175	10.2.43.128/26	10.2.43.129 – 10.2.43.190	10.2.43.191
176	10.2.43.192/26	10.2.43.193 – 10.2.43.254	10.2.43.255
177	10.2.44.0/26	10.2.44.1 – 10.2.44.62	10.2.44.63
178	10.2.44.64/26	10.2.44.65 – 10.2.44.126	10.2.44.127
179	10.2.44.128/26	10.2.44.129 – 10.2.44.190	10.2.44.191
180	10.2.44.192/26	10.2.44.193 – 10.2.44.254	10.2.44.255
181	10.2.45.0/26	10.2.45.1 – 10.2.45.62	10.2.45.63
182	10.2.45.64/26	10.2.45.65 – 10.2.45.126	10.2.45.127
183	10.2.45.128/26	10.2.45.129 – 10.2.45.190	10.2.45.191
184	10.2.45.192/26	10.2.45.193 – 10.2.45.254	10.2.45.255
185	10.2.46.0/26	10.2.46.1 – 10.2.46.62	10.2.46.63
186	10.2.46.64/26	10.2.46.65 – 10.2.46.126	10.2.46.127
187	10.2.46.128/26	10.2.46.129 – 10.2.46.190	10.2.46.191
188	10.2.46.192/26	10.2.46.193 – 10.2.46.254	10.2.46.255
189	10.2.47.0/26	10.2.47.1 – 10.2.47.62	10.2.47.63
190	10.2.47.64/26	10.2.47.65 – 10.2.47.126	10.2.47.127
191	10.2.47.128/26	10.2.47.129 – 10.2.47.190	10.2.47.191
192	10.2.47.192/26	10.2.47.193 – 10.2.47.254	10.2.47.255
193	10.2.48.0/26	10.2.48.1 – 10.2.48.62	10.2.48.63
194	10.2.48.64/26	10.2.48.65 – 10.2.48.126	10.2.48.127
195	10.2.48.128/26	10.2.48.129 – 10.2.48.190	10.2.48.191
196	10.2.48.192/26	10.2.48.193 – 10.2.48.254	10.2.48.255
197	10.2.49.0/26	10.2.49.1 – 10.2.49.62	10.2.49.63
198	10.2.49.64/26	10.2.49.65 – 10.2.49.126	10.2.49.127
199	10.2.49.128/26	10.2.49.129 – 10.2.49.190	10.2.49.191
200	10.2.49.192/26	10.2.49.193 – 10.2.49.254	10.2.49.255
201	10.2.50.0/26	10.2.50.1 – 10.2.50.62	10.2.50.63
202	10.2.50.64/26	10.2.50.65 – 10.2.50.126	10.2.50.127
203	10.2.50.128/26	10.2.50.129 – 10.2.50.190	10.2.50.191
204	10.2.50.192/26	10.2.50.193 – 10.2.50.254	10.2.50.255
205	10.2.51.0/26	10.2.51.1 – 10.2.51.62	10.2.51.63
206	10.2.51.64/26	10.2.51.65 – 10.2.51.126	10.2.51.127
207	10.2.51.128/26	10.2.51.129 – 10.2.51.190	10.2.51.191
208	10.2.51.192/26	10.2.51.193 – 10.2.51.254	10.2.51.255
209	10.2.52.0/26	10.2.52.1 – 10.2.52.62	10.2.52.63
210	10.2.52.64/26	10.2.52.65 – 10.2.52.126	10.2.52.127
211	10.2.52.128/26	10.2.52.129 – 10.2.52.190	10.2.52.191
212	10.2.52.192/26	10.2.52.193 – 10.2.52.254	10.2.52.255
213	10.2.53.0/26	10.2.53.1 – 10.2.53.62	10.2.53.63
214	10.2.53.64/26	10.2.53.65 – 10.2.53.126	10.2.53.127
215	10.2.53.128/26	10.2.53.129 – 10.2.53.190	10.2.53.191
216	10.2.53.192/26	10.2.53.193 – 10.2.53.254	10.2.53.255
217	10.2.54.0/26	10.2.54.1 – 10.2.54.62	10.2.54.63
218	10.2.54.64/26	10.2.54.65 – 10.2.54.126	10.2.54.127
219	10.2.54.128/26	10.2.54.129 – 10.2.54.190	10.2.54.191
220	10.2.54.192/26	10.2.54.193 – 10.2.54.254	10.2.54.255
221	10.2.55.0/26	10.2.55.1 – 10.2.55.62	10.2.55.63
222	10.2.55.64/26	10.2.55.65 – 10.2.55.126	10.2.55.127
223	10.2.55.128/26	10.2.55.129 – 10.2.55.190	10.2.55.191
224	10.2.55.192/26	10.2.55.193 – 10.2.55.254	10.2.55.255
225	10.2.56.0/26	10.2.56.1 – 10.2.56.62	10.2.56.63
226	10.2.56.64/26	10.2.56.65 – 10.2.56.126	10.2.56.127
227	10.2.56.128/26	10.2.56.129 – 10.2.56.190	10.2.56.191
228	10.2.56.192/26	10.2.56.193 – 10.2.56.254	10.2.56.255
229	10.2.57.0/26	10.2.57.1 – 10.2.57.62	10.2.57.63
230	10.2.57.64/26	10.2.57.65 – 10.2.57.126	10.2.57.127
231	10.2.57.128/26	10.2.57.129 – 10.2.57.190	10.2.57.191
232	10.2.57.192/26	10.2.57.193 – 10.2.57.254	10.2.57.255
233	10.2.58.0/26	10.2.58.1 – 10.2.58.62	10.2.58.63
234	10.2.58.64/26	10.2.58.65 – 10.2.58.126	10.2.58.127
235	10.2.58.128/26	10.2.58.129 – 10.2.58.190	10.2.58.191
236	10.2.58.192/26	10.2.58.193 – 10.2.58.254	10.2.58.255
237	10.2.59.0/26	10.2.59.1 – 10.2.59.62	10.2.59.63
238	10.2.59.64/26	10.2.59.65 – 10.2.59.126	10.2.59.127
239	10.2.59.128/26	10.2.59.129 – 10.2.59.190	10.2.59.191
240	10.2.59.192/26	10.2.59.193 – 10.2.59.254	10.2.59.255
241	10.2.60.0/26	10.2.60.1 – 10.2.60.62	10.2.60.63
242	10.2.60.64/26	10.2.60.65 – 10.2.60.126	10.2.60.127
243	10.2.60.128/26	10.2.60.129 – 10.2.60.190	10.2.60.191
244	10.2.60.192/26	10.2.60.193 – 10.2.60.254	10.2.60.255
245	10.2.61.0/26	10.2.61.1 – 10.2.61.62	10.2.61.63
246	10.2.61.64/26	10.2.61.65 – 10.2.61.126	10.2.61.127
247	10.2.61.128/26	10.2.61.129 – 10.2.61.190	10.2.61.191
248	10.2.61.192/26	10.2.61.193 – 10.2.61.254	10.2.61.255
249	10.2.62.0/26	10.2.62.1 – 10.2.62.62	10.2.62.63
250	10.2.62.64/26	10.2.62.65 – 10.2.62.126	10.2.62.127
251	10.2.62.128/26	10.2.62.129 – 10.2.62.190	10.2.62.191
252	10.2.62.192/26	10.2.62.193 – 10.2.62.254	10.2.62.255
253	10.2.63.0/26	10.2.63.1 – 10.2.63.62	10.2.63.63
254	10.2.63.64/26	10.2.63.65 – 10.2.63.126	10.2.63.127
255	10.2.63.128/26	10.2.63.129 – 10.2.63.190	10.2.63.191
256	10.2.63.192/26	10.2.63.193 – 10.2.63.254	10.2.63.255

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 /18
/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	-
/18	255.255.192.0	16,384	16,382	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →