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)10.21.32.0/19

network10.21.32.0/19

broadcast10.21.63.255

first host10.21.32.1

last host10.21.63.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.21.32.0/19

address00001010.00010101.00100000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010101.00100000.00000000

broadcast00001010.00010101.00111111.11111111

green = network part, grey = host part

hex0x0a152000

decimal169156608

reverse dns0.32.21.10.in-addr.arpa

ipv4-mapped::ffff:a15:2000

/19 split into /27 · 256 subnets

close ×

#	network	host range	broadcast
1	10.21.32.0/27	10.21.32.1 – 10.21.32.30	10.21.32.31
2	10.21.32.32/27	10.21.32.33 – 10.21.32.62	10.21.32.63
3	10.21.32.64/27	10.21.32.65 – 10.21.32.94	10.21.32.95
4	10.21.32.96/27	10.21.32.97 – 10.21.32.126	10.21.32.127
5	10.21.32.128/27	10.21.32.129 – 10.21.32.158	10.21.32.159
6	10.21.32.160/27	10.21.32.161 – 10.21.32.190	10.21.32.191
7	10.21.32.192/27	10.21.32.193 – 10.21.32.222	10.21.32.223
8	10.21.32.224/27	10.21.32.225 – 10.21.32.254	10.21.32.255
9	10.21.33.0/27	10.21.33.1 – 10.21.33.30	10.21.33.31
10	10.21.33.32/27	10.21.33.33 – 10.21.33.62	10.21.33.63
11	10.21.33.64/27	10.21.33.65 – 10.21.33.94	10.21.33.95
12	10.21.33.96/27	10.21.33.97 – 10.21.33.126	10.21.33.127
13	10.21.33.128/27	10.21.33.129 – 10.21.33.158	10.21.33.159
14	10.21.33.160/27	10.21.33.161 – 10.21.33.190	10.21.33.191
15	10.21.33.192/27	10.21.33.193 – 10.21.33.222	10.21.33.223
16	10.21.33.224/27	10.21.33.225 – 10.21.33.254	10.21.33.255
17	10.21.34.0/27	10.21.34.1 – 10.21.34.30	10.21.34.31
18	10.21.34.32/27	10.21.34.33 – 10.21.34.62	10.21.34.63
19	10.21.34.64/27	10.21.34.65 – 10.21.34.94	10.21.34.95
20	10.21.34.96/27	10.21.34.97 – 10.21.34.126	10.21.34.127
21	10.21.34.128/27	10.21.34.129 – 10.21.34.158	10.21.34.159
22	10.21.34.160/27	10.21.34.161 – 10.21.34.190	10.21.34.191
23	10.21.34.192/27	10.21.34.193 – 10.21.34.222	10.21.34.223
24	10.21.34.224/27	10.21.34.225 – 10.21.34.254	10.21.34.255
25	10.21.35.0/27	10.21.35.1 – 10.21.35.30	10.21.35.31
26	10.21.35.32/27	10.21.35.33 – 10.21.35.62	10.21.35.63
27	10.21.35.64/27	10.21.35.65 – 10.21.35.94	10.21.35.95
28	10.21.35.96/27	10.21.35.97 – 10.21.35.126	10.21.35.127
29	10.21.35.128/27	10.21.35.129 – 10.21.35.158	10.21.35.159
30	10.21.35.160/27	10.21.35.161 – 10.21.35.190	10.21.35.191
31	10.21.35.192/27	10.21.35.193 – 10.21.35.222	10.21.35.223
32	10.21.35.224/27	10.21.35.225 – 10.21.35.254	10.21.35.255
33	10.21.36.0/27	10.21.36.1 – 10.21.36.30	10.21.36.31
34	10.21.36.32/27	10.21.36.33 – 10.21.36.62	10.21.36.63
35	10.21.36.64/27	10.21.36.65 – 10.21.36.94	10.21.36.95
36	10.21.36.96/27	10.21.36.97 – 10.21.36.126	10.21.36.127
37	10.21.36.128/27	10.21.36.129 – 10.21.36.158	10.21.36.159
38	10.21.36.160/27	10.21.36.161 – 10.21.36.190	10.21.36.191
39	10.21.36.192/27	10.21.36.193 – 10.21.36.222	10.21.36.223
40	10.21.36.224/27	10.21.36.225 – 10.21.36.254	10.21.36.255
41	10.21.37.0/27	10.21.37.1 – 10.21.37.30	10.21.37.31
42	10.21.37.32/27	10.21.37.33 – 10.21.37.62	10.21.37.63
43	10.21.37.64/27	10.21.37.65 – 10.21.37.94	10.21.37.95
44	10.21.37.96/27	10.21.37.97 – 10.21.37.126	10.21.37.127
45	10.21.37.128/27	10.21.37.129 – 10.21.37.158	10.21.37.159
46	10.21.37.160/27	10.21.37.161 – 10.21.37.190	10.21.37.191
47	10.21.37.192/27	10.21.37.193 – 10.21.37.222	10.21.37.223
48	10.21.37.224/27	10.21.37.225 – 10.21.37.254	10.21.37.255
49	10.21.38.0/27	10.21.38.1 – 10.21.38.30	10.21.38.31
50	10.21.38.32/27	10.21.38.33 – 10.21.38.62	10.21.38.63
51	10.21.38.64/27	10.21.38.65 – 10.21.38.94	10.21.38.95
52	10.21.38.96/27	10.21.38.97 – 10.21.38.126	10.21.38.127
53	10.21.38.128/27	10.21.38.129 – 10.21.38.158	10.21.38.159
54	10.21.38.160/27	10.21.38.161 – 10.21.38.190	10.21.38.191
55	10.21.38.192/27	10.21.38.193 – 10.21.38.222	10.21.38.223
56	10.21.38.224/27	10.21.38.225 – 10.21.38.254	10.21.38.255
57	10.21.39.0/27	10.21.39.1 – 10.21.39.30	10.21.39.31
58	10.21.39.32/27	10.21.39.33 – 10.21.39.62	10.21.39.63
59	10.21.39.64/27	10.21.39.65 – 10.21.39.94	10.21.39.95
60	10.21.39.96/27	10.21.39.97 – 10.21.39.126	10.21.39.127
61	10.21.39.128/27	10.21.39.129 – 10.21.39.158	10.21.39.159
62	10.21.39.160/27	10.21.39.161 – 10.21.39.190	10.21.39.191
63	10.21.39.192/27	10.21.39.193 – 10.21.39.222	10.21.39.223
64	10.21.39.224/27	10.21.39.225 – 10.21.39.254	10.21.39.255
65	10.21.40.0/27	10.21.40.1 – 10.21.40.30	10.21.40.31
66	10.21.40.32/27	10.21.40.33 – 10.21.40.62	10.21.40.63
67	10.21.40.64/27	10.21.40.65 – 10.21.40.94	10.21.40.95
68	10.21.40.96/27	10.21.40.97 – 10.21.40.126	10.21.40.127
69	10.21.40.128/27	10.21.40.129 – 10.21.40.158	10.21.40.159
70	10.21.40.160/27	10.21.40.161 – 10.21.40.190	10.21.40.191
71	10.21.40.192/27	10.21.40.193 – 10.21.40.222	10.21.40.223
72	10.21.40.224/27	10.21.40.225 – 10.21.40.254	10.21.40.255
73	10.21.41.0/27	10.21.41.1 – 10.21.41.30	10.21.41.31
74	10.21.41.32/27	10.21.41.33 – 10.21.41.62	10.21.41.63
75	10.21.41.64/27	10.21.41.65 – 10.21.41.94	10.21.41.95
76	10.21.41.96/27	10.21.41.97 – 10.21.41.126	10.21.41.127
77	10.21.41.128/27	10.21.41.129 – 10.21.41.158	10.21.41.159
78	10.21.41.160/27	10.21.41.161 – 10.21.41.190	10.21.41.191
79	10.21.41.192/27	10.21.41.193 – 10.21.41.222	10.21.41.223
80	10.21.41.224/27	10.21.41.225 – 10.21.41.254	10.21.41.255
81	10.21.42.0/27	10.21.42.1 – 10.21.42.30	10.21.42.31
82	10.21.42.32/27	10.21.42.33 – 10.21.42.62	10.21.42.63
83	10.21.42.64/27	10.21.42.65 – 10.21.42.94	10.21.42.95
84	10.21.42.96/27	10.21.42.97 – 10.21.42.126	10.21.42.127
85	10.21.42.128/27	10.21.42.129 – 10.21.42.158	10.21.42.159
86	10.21.42.160/27	10.21.42.161 – 10.21.42.190	10.21.42.191
87	10.21.42.192/27	10.21.42.193 – 10.21.42.222	10.21.42.223
88	10.21.42.224/27	10.21.42.225 – 10.21.42.254	10.21.42.255
89	10.21.43.0/27	10.21.43.1 – 10.21.43.30	10.21.43.31
90	10.21.43.32/27	10.21.43.33 – 10.21.43.62	10.21.43.63
91	10.21.43.64/27	10.21.43.65 – 10.21.43.94	10.21.43.95
92	10.21.43.96/27	10.21.43.97 – 10.21.43.126	10.21.43.127
93	10.21.43.128/27	10.21.43.129 – 10.21.43.158	10.21.43.159
94	10.21.43.160/27	10.21.43.161 – 10.21.43.190	10.21.43.191
95	10.21.43.192/27	10.21.43.193 – 10.21.43.222	10.21.43.223
96	10.21.43.224/27	10.21.43.225 – 10.21.43.254	10.21.43.255
97	10.21.44.0/27	10.21.44.1 – 10.21.44.30	10.21.44.31
98	10.21.44.32/27	10.21.44.33 – 10.21.44.62	10.21.44.63
99	10.21.44.64/27	10.21.44.65 – 10.21.44.94	10.21.44.95
100	10.21.44.96/27	10.21.44.97 – 10.21.44.126	10.21.44.127
101	10.21.44.128/27	10.21.44.129 – 10.21.44.158	10.21.44.159
102	10.21.44.160/27	10.21.44.161 – 10.21.44.190	10.21.44.191
103	10.21.44.192/27	10.21.44.193 – 10.21.44.222	10.21.44.223
104	10.21.44.224/27	10.21.44.225 – 10.21.44.254	10.21.44.255
105	10.21.45.0/27	10.21.45.1 – 10.21.45.30	10.21.45.31
106	10.21.45.32/27	10.21.45.33 – 10.21.45.62	10.21.45.63
107	10.21.45.64/27	10.21.45.65 – 10.21.45.94	10.21.45.95
108	10.21.45.96/27	10.21.45.97 – 10.21.45.126	10.21.45.127
109	10.21.45.128/27	10.21.45.129 – 10.21.45.158	10.21.45.159
110	10.21.45.160/27	10.21.45.161 – 10.21.45.190	10.21.45.191
111	10.21.45.192/27	10.21.45.193 – 10.21.45.222	10.21.45.223
112	10.21.45.224/27	10.21.45.225 – 10.21.45.254	10.21.45.255
113	10.21.46.0/27	10.21.46.1 – 10.21.46.30	10.21.46.31
114	10.21.46.32/27	10.21.46.33 – 10.21.46.62	10.21.46.63
115	10.21.46.64/27	10.21.46.65 – 10.21.46.94	10.21.46.95
116	10.21.46.96/27	10.21.46.97 – 10.21.46.126	10.21.46.127
117	10.21.46.128/27	10.21.46.129 – 10.21.46.158	10.21.46.159
118	10.21.46.160/27	10.21.46.161 – 10.21.46.190	10.21.46.191
119	10.21.46.192/27	10.21.46.193 – 10.21.46.222	10.21.46.223
120	10.21.46.224/27	10.21.46.225 – 10.21.46.254	10.21.46.255
121	10.21.47.0/27	10.21.47.1 – 10.21.47.30	10.21.47.31
122	10.21.47.32/27	10.21.47.33 – 10.21.47.62	10.21.47.63
123	10.21.47.64/27	10.21.47.65 – 10.21.47.94	10.21.47.95
124	10.21.47.96/27	10.21.47.97 – 10.21.47.126	10.21.47.127
125	10.21.47.128/27	10.21.47.129 – 10.21.47.158	10.21.47.159
126	10.21.47.160/27	10.21.47.161 – 10.21.47.190	10.21.47.191
127	10.21.47.192/27	10.21.47.193 – 10.21.47.222	10.21.47.223
128	10.21.47.224/27	10.21.47.225 – 10.21.47.254	10.21.47.255
129	10.21.48.0/27	10.21.48.1 – 10.21.48.30	10.21.48.31
130	10.21.48.32/27	10.21.48.33 – 10.21.48.62	10.21.48.63
131	10.21.48.64/27	10.21.48.65 – 10.21.48.94	10.21.48.95
132	10.21.48.96/27	10.21.48.97 – 10.21.48.126	10.21.48.127
133	10.21.48.128/27	10.21.48.129 – 10.21.48.158	10.21.48.159
134	10.21.48.160/27	10.21.48.161 – 10.21.48.190	10.21.48.191
135	10.21.48.192/27	10.21.48.193 – 10.21.48.222	10.21.48.223
136	10.21.48.224/27	10.21.48.225 – 10.21.48.254	10.21.48.255
137	10.21.49.0/27	10.21.49.1 – 10.21.49.30	10.21.49.31
138	10.21.49.32/27	10.21.49.33 – 10.21.49.62	10.21.49.63
139	10.21.49.64/27	10.21.49.65 – 10.21.49.94	10.21.49.95
140	10.21.49.96/27	10.21.49.97 – 10.21.49.126	10.21.49.127
141	10.21.49.128/27	10.21.49.129 – 10.21.49.158	10.21.49.159
142	10.21.49.160/27	10.21.49.161 – 10.21.49.190	10.21.49.191
143	10.21.49.192/27	10.21.49.193 – 10.21.49.222	10.21.49.223
144	10.21.49.224/27	10.21.49.225 – 10.21.49.254	10.21.49.255
145	10.21.50.0/27	10.21.50.1 – 10.21.50.30	10.21.50.31
146	10.21.50.32/27	10.21.50.33 – 10.21.50.62	10.21.50.63
147	10.21.50.64/27	10.21.50.65 – 10.21.50.94	10.21.50.95
148	10.21.50.96/27	10.21.50.97 – 10.21.50.126	10.21.50.127
149	10.21.50.128/27	10.21.50.129 – 10.21.50.158	10.21.50.159
150	10.21.50.160/27	10.21.50.161 – 10.21.50.190	10.21.50.191
151	10.21.50.192/27	10.21.50.193 – 10.21.50.222	10.21.50.223
152	10.21.50.224/27	10.21.50.225 – 10.21.50.254	10.21.50.255
153	10.21.51.0/27	10.21.51.1 – 10.21.51.30	10.21.51.31
154	10.21.51.32/27	10.21.51.33 – 10.21.51.62	10.21.51.63
155	10.21.51.64/27	10.21.51.65 – 10.21.51.94	10.21.51.95
156	10.21.51.96/27	10.21.51.97 – 10.21.51.126	10.21.51.127
157	10.21.51.128/27	10.21.51.129 – 10.21.51.158	10.21.51.159
158	10.21.51.160/27	10.21.51.161 – 10.21.51.190	10.21.51.191
159	10.21.51.192/27	10.21.51.193 – 10.21.51.222	10.21.51.223
160	10.21.51.224/27	10.21.51.225 – 10.21.51.254	10.21.51.255
161	10.21.52.0/27	10.21.52.1 – 10.21.52.30	10.21.52.31
162	10.21.52.32/27	10.21.52.33 – 10.21.52.62	10.21.52.63
163	10.21.52.64/27	10.21.52.65 – 10.21.52.94	10.21.52.95
164	10.21.52.96/27	10.21.52.97 – 10.21.52.126	10.21.52.127
165	10.21.52.128/27	10.21.52.129 – 10.21.52.158	10.21.52.159
166	10.21.52.160/27	10.21.52.161 – 10.21.52.190	10.21.52.191
167	10.21.52.192/27	10.21.52.193 – 10.21.52.222	10.21.52.223
168	10.21.52.224/27	10.21.52.225 – 10.21.52.254	10.21.52.255
169	10.21.53.0/27	10.21.53.1 – 10.21.53.30	10.21.53.31
170	10.21.53.32/27	10.21.53.33 – 10.21.53.62	10.21.53.63
171	10.21.53.64/27	10.21.53.65 – 10.21.53.94	10.21.53.95
172	10.21.53.96/27	10.21.53.97 – 10.21.53.126	10.21.53.127
173	10.21.53.128/27	10.21.53.129 – 10.21.53.158	10.21.53.159
174	10.21.53.160/27	10.21.53.161 – 10.21.53.190	10.21.53.191
175	10.21.53.192/27	10.21.53.193 – 10.21.53.222	10.21.53.223
176	10.21.53.224/27	10.21.53.225 – 10.21.53.254	10.21.53.255
177	10.21.54.0/27	10.21.54.1 – 10.21.54.30	10.21.54.31
178	10.21.54.32/27	10.21.54.33 – 10.21.54.62	10.21.54.63
179	10.21.54.64/27	10.21.54.65 – 10.21.54.94	10.21.54.95
180	10.21.54.96/27	10.21.54.97 – 10.21.54.126	10.21.54.127
181	10.21.54.128/27	10.21.54.129 – 10.21.54.158	10.21.54.159
182	10.21.54.160/27	10.21.54.161 – 10.21.54.190	10.21.54.191
183	10.21.54.192/27	10.21.54.193 – 10.21.54.222	10.21.54.223
184	10.21.54.224/27	10.21.54.225 – 10.21.54.254	10.21.54.255
185	10.21.55.0/27	10.21.55.1 – 10.21.55.30	10.21.55.31
186	10.21.55.32/27	10.21.55.33 – 10.21.55.62	10.21.55.63
187	10.21.55.64/27	10.21.55.65 – 10.21.55.94	10.21.55.95
188	10.21.55.96/27	10.21.55.97 – 10.21.55.126	10.21.55.127
189	10.21.55.128/27	10.21.55.129 – 10.21.55.158	10.21.55.159
190	10.21.55.160/27	10.21.55.161 – 10.21.55.190	10.21.55.191
191	10.21.55.192/27	10.21.55.193 – 10.21.55.222	10.21.55.223
192	10.21.55.224/27	10.21.55.225 – 10.21.55.254	10.21.55.255
193	10.21.56.0/27	10.21.56.1 – 10.21.56.30	10.21.56.31
194	10.21.56.32/27	10.21.56.33 – 10.21.56.62	10.21.56.63
195	10.21.56.64/27	10.21.56.65 – 10.21.56.94	10.21.56.95
196	10.21.56.96/27	10.21.56.97 – 10.21.56.126	10.21.56.127
197	10.21.56.128/27	10.21.56.129 – 10.21.56.158	10.21.56.159
198	10.21.56.160/27	10.21.56.161 – 10.21.56.190	10.21.56.191
199	10.21.56.192/27	10.21.56.193 – 10.21.56.222	10.21.56.223
200	10.21.56.224/27	10.21.56.225 – 10.21.56.254	10.21.56.255
201	10.21.57.0/27	10.21.57.1 – 10.21.57.30	10.21.57.31
202	10.21.57.32/27	10.21.57.33 – 10.21.57.62	10.21.57.63
203	10.21.57.64/27	10.21.57.65 – 10.21.57.94	10.21.57.95
204	10.21.57.96/27	10.21.57.97 – 10.21.57.126	10.21.57.127
205	10.21.57.128/27	10.21.57.129 – 10.21.57.158	10.21.57.159
206	10.21.57.160/27	10.21.57.161 – 10.21.57.190	10.21.57.191
207	10.21.57.192/27	10.21.57.193 – 10.21.57.222	10.21.57.223
208	10.21.57.224/27	10.21.57.225 – 10.21.57.254	10.21.57.255
209	10.21.58.0/27	10.21.58.1 – 10.21.58.30	10.21.58.31
210	10.21.58.32/27	10.21.58.33 – 10.21.58.62	10.21.58.63
211	10.21.58.64/27	10.21.58.65 – 10.21.58.94	10.21.58.95
212	10.21.58.96/27	10.21.58.97 – 10.21.58.126	10.21.58.127
213	10.21.58.128/27	10.21.58.129 – 10.21.58.158	10.21.58.159
214	10.21.58.160/27	10.21.58.161 – 10.21.58.190	10.21.58.191
215	10.21.58.192/27	10.21.58.193 – 10.21.58.222	10.21.58.223
216	10.21.58.224/27	10.21.58.225 – 10.21.58.254	10.21.58.255
217	10.21.59.0/27	10.21.59.1 – 10.21.59.30	10.21.59.31
218	10.21.59.32/27	10.21.59.33 – 10.21.59.62	10.21.59.63
219	10.21.59.64/27	10.21.59.65 – 10.21.59.94	10.21.59.95
220	10.21.59.96/27	10.21.59.97 – 10.21.59.126	10.21.59.127
221	10.21.59.128/27	10.21.59.129 – 10.21.59.158	10.21.59.159
222	10.21.59.160/27	10.21.59.161 – 10.21.59.190	10.21.59.191
223	10.21.59.192/27	10.21.59.193 – 10.21.59.222	10.21.59.223
224	10.21.59.224/27	10.21.59.225 – 10.21.59.254	10.21.59.255
225	10.21.60.0/27	10.21.60.1 – 10.21.60.30	10.21.60.31
226	10.21.60.32/27	10.21.60.33 – 10.21.60.62	10.21.60.63
227	10.21.60.64/27	10.21.60.65 – 10.21.60.94	10.21.60.95
228	10.21.60.96/27	10.21.60.97 – 10.21.60.126	10.21.60.127
229	10.21.60.128/27	10.21.60.129 – 10.21.60.158	10.21.60.159
230	10.21.60.160/27	10.21.60.161 – 10.21.60.190	10.21.60.191
231	10.21.60.192/27	10.21.60.193 – 10.21.60.222	10.21.60.223
232	10.21.60.224/27	10.21.60.225 – 10.21.60.254	10.21.60.255
233	10.21.61.0/27	10.21.61.1 – 10.21.61.30	10.21.61.31
234	10.21.61.32/27	10.21.61.33 – 10.21.61.62	10.21.61.63
235	10.21.61.64/27	10.21.61.65 – 10.21.61.94	10.21.61.95
236	10.21.61.96/27	10.21.61.97 – 10.21.61.126	10.21.61.127
237	10.21.61.128/27	10.21.61.129 – 10.21.61.158	10.21.61.159
238	10.21.61.160/27	10.21.61.161 – 10.21.61.190	10.21.61.191
239	10.21.61.192/27	10.21.61.193 – 10.21.61.222	10.21.61.223
240	10.21.61.224/27	10.21.61.225 – 10.21.61.254	10.21.61.255
241	10.21.62.0/27	10.21.62.1 – 10.21.62.30	10.21.62.31
242	10.21.62.32/27	10.21.62.33 – 10.21.62.62	10.21.62.63
243	10.21.62.64/27	10.21.62.65 – 10.21.62.94	10.21.62.95
244	10.21.62.96/27	10.21.62.97 – 10.21.62.126	10.21.62.127
245	10.21.62.128/27	10.21.62.129 – 10.21.62.158	10.21.62.159
246	10.21.62.160/27	10.21.62.161 – 10.21.62.190	10.21.62.191
247	10.21.62.192/27	10.21.62.193 – 10.21.62.222	10.21.62.223
248	10.21.62.224/27	10.21.62.225 – 10.21.62.254	10.21.62.255
249	10.21.63.0/27	10.21.63.1 – 10.21.63.30	10.21.63.31
250	10.21.63.32/27	10.21.63.33 – 10.21.63.62	10.21.63.63
251	10.21.63.64/27	10.21.63.65 – 10.21.63.94	10.21.63.95
252	10.21.63.96/27	10.21.63.97 – 10.21.63.126	10.21.63.127
253	10.21.63.128/27	10.21.63.129 – 10.21.63.158	10.21.63.159
254	10.21.63.160/27	10.21.63.161 – 10.21.63.190	10.21.63.191
255	10.21.63.192/27	10.21.63.193 – 10.21.63.222	10.21.63.223
256	10.21.63.224/27	10.21.63.225 – 10.21.63.254	10.21.63.255

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