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)10.121.128.0/17

network10.121.128.0/17

broadcast10.121.255.255

first host10.121.128.1

last host10.121.255.254

subnet mask255.255.128.0

wildcard0.0.127.255

addresses32,768

usable hosts32,766

classA

ipcalc 10.121.128.0/17

address00001010.01111001.10000000.00000000

subnet mask11111111.11111111.10000000.00000000

network00001010.01111001.10000000.00000000

broadcast00001010.01111001.11111111.11111111

green = network part, grey = host part

hex0x0a798000

decimal175734784

reverse dns0.128.121.10.in-addr.arpa

ipv4-mapped::ffff:a79:8000

/17 split into /31 · 16,384 subnets

close ×

#	network	host range	broadcast
1	10.121.128.0/31	10.121.128.0 – 10.121.128.1	10.121.128.1
2	10.121.128.2/31	10.121.128.2 – 10.121.128.3	10.121.128.3
3	10.121.128.4/31	10.121.128.4 – 10.121.128.5	10.121.128.5
4	10.121.128.6/31	10.121.128.6 – 10.121.128.7	10.121.128.7
5	10.121.128.8/31	10.121.128.8 – 10.121.128.9	10.121.128.9
6	10.121.128.10/31	10.121.128.10 – 10.121.128.11	10.121.128.11
7	10.121.128.12/31	10.121.128.12 – 10.121.128.13	10.121.128.13
8	10.121.128.14/31	10.121.128.14 – 10.121.128.15	10.121.128.15
9	10.121.128.16/31	10.121.128.16 – 10.121.128.17	10.121.128.17
10	10.121.128.18/31	10.121.128.18 – 10.121.128.19	10.121.128.19
11	10.121.128.20/31	10.121.128.20 – 10.121.128.21	10.121.128.21
12	10.121.128.22/31	10.121.128.22 – 10.121.128.23	10.121.128.23
13	10.121.128.24/31	10.121.128.24 – 10.121.128.25	10.121.128.25
14	10.121.128.26/31	10.121.128.26 – 10.121.128.27	10.121.128.27
15	10.121.128.28/31	10.121.128.28 – 10.121.128.29	10.121.128.29
16	10.121.128.30/31	10.121.128.30 – 10.121.128.31	10.121.128.31
17	10.121.128.32/31	10.121.128.32 – 10.121.128.33	10.121.128.33
18	10.121.128.34/31	10.121.128.34 – 10.121.128.35	10.121.128.35
19	10.121.128.36/31	10.121.128.36 – 10.121.128.37	10.121.128.37
20	10.121.128.38/31	10.121.128.38 – 10.121.128.39	10.121.128.39
21	10.121.128.40/31	10.121.128.40 – 10.121.128.41	10.121.128.41
22	10.121.128.42/31	10.121.128.42 – 10.121.128.43	10.121.128.43
23	10.121.128.44/31	10.121.128.44 – 10.121.128.45	10.121.128.45
24	10.121.128.46/31	10.121.128.46 – 10.121.128.47	10.121.128.47
25	10.121.128.48/31	10.121.128.48 – 10.121.128.49	10.121.128.49
26	10.121.128.50/31	10.121.128.50 – 10.121.128.51	10.121.128.51
27	10.121.128.52/31	10.121.128.52 – 10.121.128.53	10.121.128.53
28	10.121.128.54/31	10.121.128.54 – 10.121.128.55	10.121.128.55
29	10.121.128.56/31	10.121.128.56 – 10.121.128.57	10.121.128.57
30	10.121.128.58/31	10.121.128.58 – 10.121.128.59	10.121.128.59
31	10.121.128.60/31	10.121.128.60 – 10.121.128.61	10.121.128.61
32	10.121.128.62/31	10.121.128.62 – 10.121.128.63	10.121.128.63
33	10.121.128.64/31	10.121.128.64 – 10.121.128.65	10.121.128.65
34	10.121.128.66/31	10.121.128.66 – 10.121.128.67	10.121.128.67
35	10.121.128.68/31	10.121.128.68 – 10.121.128.69	10.121.128.69
36	10.121.128.70/31	10.121.128.70 – 10.121.128.71	10.121.128.71
37	10.121.128.72/31	10.121.128.72 – 10.121.128.73	10.121.128.73
38	10.121.128.74/31	10.121.128.74 – 10.121.128.75	10.121.128.75
39	10.121.128.76/31	10.121.128.76 – 10.121.128.77	10.121.128.77
40	10.121.128.78/31	10.121.128.78 – 10.121.128.79	10.121.128.79
41	10.121.128.80/31	10.121.128.80 – 10.121.128.81	10.121.128.81
42	10.121.128.82/31	10.121.128.82 – 10.121.128.83	10.121.128.83
43	10.121.128.84/31	10.121.128.84 – 10.121.128.85	10.121.128.85
44	10.121.128.86/31	10.121.128.86 – 10.121.128.87	10.121.128.87
45	10.121.128.88/31	10.121.128.88 – 10.121.128.89	10.121.128.89
46	10.121.128.90/31	10.121.128.90 – 10.121.128.91	10.121.128.91
47	10.121.128.92/31	10.121.128.92 – 10.121.128.93	10.121.128.93
48	10.121.128.94/31	10.121.128.94 – 10.121.128.95	10.121.128.95
49	10.121.128.96/31	10.121.128.96 – 10.121.128.97	10.121.128.97
50	10.121.128.98/31	10.121.128.98 – 10.121.128.99	10.121.128.99
51	10.121.128.100/31	10.121.128.100 – 10.121.128.101	10.121.128.101
52	10.121.128.102/31	10.121.128.102 – 10.121.128.103	10.121.128.103
53	10.121.128.104/31	10.121.128.104 – 10.121.128.105	10.121.128.105
54	10.121.128.106/31	10.121.128.106 – 10.121.128.107	10.121.128.107
55	10.121.128.108/31	10.121.128.108 – 10.121.128.109	10.121.128.109
56	10.121.128.110/31	10.121.128.110 – 10.121.128.111	10.121.128.111
57	10.121.128.112/31	10.121.128.112 – 10.121.128.113	10.121.128.113
58	10.121.128.114/31	10.121.128.114 – 10.121.128.115	10.121.128.115
59	10.121.128.116/31	10.121.128.116 – 10.121.128.117	10.121.128.117
60	10.121.128.118/31	10.121.128.118 – 10.121.128.119	10.121.128.119
61	10.121.128.120/31	10.121.128.120 – 10.121.128.121	10.121.128.121
62	10.121.128.122/31	10.121.128.122 – 10.121.128.123	10.121.128.123
63	10.121.128.124/31	10.121.128.124 – 10.121.128.125	10.121.128.125
64	10.121.128.126/31	10.121.128.126 – 10.121.128.127	10.121.128.127
65	10.121.128.128/31	10.121.128.128 – 10.121.128.129	10.121.128.129
66	10.121.128.130/31	10.121.128.130 – 10.121.128.131	10.121.128.131
67	10.121.128.132/31	10.121.128.132 – 10.121.128.133	10.121.128.133
68	10.121.128.134/31	10.121.128.134 – 10.121.128.135	10.121.128.135
69	10.121.128.136/31	10.121.128.136 – 10.121.128.137	10.121.128.137
70	10.121.128.138/31	10.121.128.138 – 10.121.128.139	10.121.128.139
71	10.121.128.140/31	10.121.128.140 – 10.121.128.141	10.121.128.141
72	10.121.128.142/31	10.121.128.142 – 10.121.128.143	10.121.128.143
73	10.121.128.144/31	10.121.128.144 – 10.121.128.145	10.121.128.145
74	10.121.128.146/31	10.121.128.146 – 10.121.128.147	10.121.128.147
75	10.121.128.148/31	10.121.128.148 – 10.121.128.149	10.121.128.149
76	10.121.128.150/31	10.121.128.150 – 10.121.128.151	10.121.128.151
77	10.121.128.152/31	10.121.128.152 – 10.121.128.153	10.121.128.153
78	10.121.128.154/31	10.121.128.154 – 10.121.128.155	10.121.128.155
79	10.121.128.156/31	10.121.128.156 – 10.121.128.157	10.121.128.157
80	10.121.128.158/31	10.121.128.158 – 10.121.128.159	10.121.128.159
81	10.121.128.160/31	10.121.128.160 – 10.121.128.161	10.121.128.161
82	10.121.128.162/31	10.121.128.162 – 10.121.128.163	10.121.128.163
83	10.121.128.164/31	10.121.128.164 – 10.121.128.165	10.121.128.165
84	10.121.128.166/31	10.121.128.166 – 10.121.128.167	10.121.128.167
85	10.121.128.168/31	10.121.128.168 – 10.121.128.169	10.121.128.169
86	10.121.128.170/31	10.121.128.170 – 10.121.128.171	10.121.128.171
87	10.121.128.172/31	10.121.128.172 – 10.121.128.173	10.121.128.173
88	10.121.128.174/31	10.121.128.174 – 10.121.128.175	10.121.128.175
89	10.121.128.176/31	10.121.128.176 – 10.121.128.177	10.121.128.177
90	10.121.128.178/31	10.121.128.178 – 10.121.128.179	10.121.128.179
91	10.121.128.180/31	10.121.128.180 – 10.121.128.181	10.121.128.181
92	10.121.128.182/31	10.121.128.182 – 10.121.128.183	10.121.128.183
93	10.121.128.184/31	10.121.128.184 – 10.121.128.185	10.121.128.185
94	10.121.128.186/31	10.121.128.186 – 10.121.128.187	10.121.128.187
95	10.121.128.188/31	10.121.128.188 – 10.121.128.189	10.121.128.189
96	10.121.128.190/31	10.121.128.190 – 10.121.128.191	10.121.128.191
97	10.121.128.192/31	10.121.128.192 – 10.121.128.193	10.121.128.193
98	10.121.128.194/31	10.121.128.194 – 10.121.128.195	10.121.128.195
99	10.121.128.196/31	10.121.128.196 – 10.121.128.197	10.121.128.197
100	10.121.128.198/31	10.121.128.198 – 10.121.128.199	10.121.128.199
101	10.121.128.200/31	10.121.128.200 – 10.121.128.201	10.121.128.201
102	10.121.128.202/31	10.121.128.202 – 10.121.128.203	10.121.128.203
103	10.121.128.204/31	10.121.128.204 – 10.121.128.205	10.121.128.205
104	10.121.128.206/31	10.121.128.206 – 10.121.128.207	10.121.128.207
105	10.121.128.208/31	10.121.128.208 – 10.121.128.209	10.121.128.209
106	10.121.128.210/31	10.121.128.210 – 10.121.128.211	10.121.128.211
107	10.121.128.212/31	10.121.128.212 – 10.121.128.213	10.121.128.213
108	10.121.128.214/31	10.121.128.214 – 10.121.128.215	10.121.128.215
109	10.121.128.216/31	10.121.128.216 – 10.121.128.217	10.121.128.217
110	10.121.128.218/31	10.121.128.218 – 10.121.128.219	10.121.128.219
111	10.121.128.220/31	10.121.128.220 – 10.121.128.221	10.121.128.221
112	10.121.128.222/31	10.121.128.222 – 10.121.128.223	10.121.128.223
113	10.121.128.224/31	10.121.128.224 – 10.121.128.225	10.121.128.225
114	10.121.128.226/31	10.121.128.226 – 10.121.128.227	10.121.128.227
115	10.121.128.228/31	10.121.128.228 – 10.121.128.229	10.121.128.229
116	10.121.128.230/31	10.121.128.230 – 10.121.128.231	10.121.128.231
117	10.121.128.232/31	10.121.128.232 – 10.121.128.233	10.121.128.233
118	10.121.128.234/31	10.121.128.234 – 10.121.128.235	10.121.128.235
119	10.121.128.236/31	10.121.128.236 – 10.121.128.237	10.121.128.237
120	10.121.128.238/31	10.121.128.238 – 10.121.128.239	10.121.128.239
121	10.121.128.240/31	10.121.128.240 – 10.121.128.241	10.121.128.241
122	10.121.128.242/31	10.121.128.242 – 10.121.128.243	10.121.128.243
123	10.121.128.244/31	10.121.128.244 – 10.121.128.245	10.121.128.245
124	10.121.128.246/31	10.121.128.246 – 10.121.128.247	10.121.128.247
125	10.121.128.248/31	10.121.128.248 – 10.121.128.249	10.121.128.249
126	10.121.128.250/31	10.121.128.250 – 10.121.128.251	10.121.128.251
127	10.121.128.252/31	10.121.128.252 – 10.121.128.253	10.121.128.253
128	10.121.128.254/31	10.121.128.254 – 10.121.128.255	10.121.128.255
129	10.121.129.0/31	10.121.129.0 – 10.121.129.1	10.121.129.1
130	10.121.129.2/31	10.121.129.2 – 10.121.129.3	10.121.129.3
131	10.121.129.4/31	10.121.129.4 – 10.121.129.5	10.121.129.5
132	10.121.129.6/31	10.121.129.6 – 10.121.129.7	10.121.129.7
133	10.121.129.8/31	10.121.129.8 – 10.121.129.9	10.121.129.9
134	10.121.129.10/31	10.121.129.10 – 10.121.129.11	10.121.129.11
135	10.121.129.12/31	10.121.129.12 – 10.121.129.13	10.121.129.13
136	10.121.129.14/31	10.121.129.14 – 10.121.129.15	10.121.129.15
137	10.121.129.16/31	10.121.129.16 – 10.121.129.17	10.121.129.17
138	10.121.129.18/31	10.121.129.18 – 10.121.129.19	10.121.129.19
139	10.121.129.20/31	10.121.129.20 – 10.121.129.21	10.121.129.21
140	10.121.129.22/31	10.121.129.22 – 10.121.129.23	10.121.129.23
141	10.121.129.24/31	10.121.129.24 – 10.121.129.25	10.121.129.25
142	10.121.129.26/31	10.121.129.26 – 10.121.129.27	10.121.129.27
143	10.121.129.28/31	10.121.129.28 – 10.121.129.29	10.121.129.29
144	10.121.129.30/31	10.121.129.30 – 10.121.129.31	10.121.129.31
145	10.121.129.32/31	10.121.129.32 – 10.121.129.33	10.121.129.33
146	10.121.129.34/31	10.121.129.34 – 10.121.129.35	10.121.129.35
147	10.121.129.36/31	10.121.129.36 – 10.121.129.37	10.121.129.37
148	10.121.129.38/31	10.121.129.38 – 10.121.129.39	10.121.129.39
149	10.121.129.40/31	10.121.129.40 – 10.121.129.41	10.121.129.41
150	10.121.129.42/31	10.121.129.42 – 10.121.129.43	10.121.129.43
151	10.121.129.44/31	10.121.129.44 – 10.121.129.45	10.121.129.45
152	10.121.129.46/31	10.121.129.46 – 10.121.129.47	10.121.129.47
153	10.121.129.48/31	10.121.129.48 – 10.121.129.49	10.121.129.49
154	10.121.129.50/31	10.121.129.50 – 10.121.129.51	10.121.129.51
155	10.121.129.52/31	10.121.129.52 – 10.121.129.53	10.121.129.53
156	10.121.129.54/31	10.121.129.54 – 10.121.129.55	10.121.129.55
157	10.121.129.56/31	10.121.129.56 – 10.121.129.57	10.121.129.57
158	10.121.129.58/31	10.121.129.58 – 10.121.129.59	10.121.129.59
159	10.121.129.60/31	10.121.129.60 – 10.121.129.61	10.121.129.61
160	10.121.129.62/31	10.121.129.62 – 10.121.129.63	10.121.129.63
161	10.121.129.64/31	10.121.129.64 – 10.121.129.65	10.121.129.65
162	10.121.129.66/31	10.121.129.66 – 10.121.129.67	10.121.129.67
163	10.121.129.68/31	10.121.129.68 – 10.121.129.69	10.121.129.69
164	10.121.129.70/31	10.121.129.70 – 10.121.129.71	10.121.129.71
165	10.121.129.72/31	10.121.129.72 – 10.121.129.73	10.121.129.73
166	10.121.129.74/31	10.121.129.74 – 10.121.129.75	10.121.129.75
167	10.121.129.76/31	10.121.129.76 – 10.121.129.77	10.121.129.77
168	10.121.129.78/31	10.121.129.78 – 10.121.129.79	10.121.129.79
169	10.121.129.80/31	10.121.129.80 – 10.121.129.81	10.121.129.81
170	10.121.129.82/31	10.121.129.82 – 10.121.129.83	10.121.129.83
171	10.121.129.84/31	10.121.129.84 – 10.121.129.85	10.121.129.85
172	10.121.129.86/31	10.121.129.86 – 10.121.129.87	10.121.129.87
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175	10.121.129.92/31	10.121.129.92 – 10.121.129.93	10.121.129.93
176	10.121.129.94/31	10.121.129.94 – 10.121.129.95	10.121.129.95
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197	10.121.129.136/31	10.121.129.136 – 10.121.129.137	10.121.129.137
198	10.121.129.138/31	10.121.129.138 – 10.121.129.139	10.121.129.139
199	10.121.129.140/31	10.121.129.140 – 10.121.129.141	10.121.129.141
200	10.121.129.142/31	10.121.129.142 – 10.121.129.143	10.121.129.143
201	10.121.129.144/31	10.121.129.144 – 10.121.129.145	10.121.129.145
202	10.121.129.146/31	10.121.129.146 – 10.121.129.147	10.121.129.147
203	10.121.129.148/31	10.121.129.148 – 10.121.129.149	10.121.129.149
204	10.121.129.150/31	10.121.129.150 – 10.121.129.151	10.121.129.151
205	10.121.129.152/31	10.121.129.152 – 10.121.129.153	10.121.129.153
206	10.121.129.154/31	10.121.129.154 – 10.121.129.155	10.121.129.155
207	10.121.129.156/31	10.121.129.156 – 10.121.129.157	10.121.129.157
208	10.121.129.158/31	10.121.129.158 – 10.121.129.159	10.121.129.159
209	10.121.129.160/31	10.121.129.160 – 10.121.129.161	10.121.129.161
210	10.121.129.162/31	10.121.129.162 – 10.121.129.163	10.121.129.163
211	10.121.129.164/31	10.121.129.164 – 10.121.129.165	10.121.129.165
212	10.121.129.166/31	10.121.129.166 – 10.121.129.167	10.121.129.167
213	10.121.129.168/31	10.121.129.168 – 10.121.129.169	10.121.129.169
214	10.121.129.170/31	10.121.129.170 – 10.121.129.171	10.121.129.171
215	10.121.129.172/31	10.121.129.172 – 10.121.129.173	10.121.129.173
216	10.121.129.174/31	10.121.129.174 – 10.121.129.175	10.121.129.175
217	10.121.129.176/31	10.121.129.176 – 10.121.129.177	10.121.129.177
218	10.121.129.178/31	10.121.129.178 – 10.121.129.179	10.121.129.179
219	10.121.129.180/31	10.121.129.180 – 10.121.129.181	10.121.129.181
220	10.121.129.182/31	10.121.129.182 – 10.121.129.183	10.121.129.183
221	10.121.129.184/31	10.121.129.184 – 10.121.129.185	10.121.129.185
222	10.121.129.186/31	10.121.129.186 – 10.121.129.187	10.121.129.187
223	10.121.129.188/31	10.121.129.188 – 10.121.129.189	10.121.129.189
224	10.121.129.190/31	10.121.129.190 – 10.121.129.191	10.121.129.191
225	10.121.129.192/31	10.121.129.192 – 10.121.129.193	10.121.129.193
226	10.121.129.194/31	10.121.129.194 – 10.121.129.195	10.121.129.195
227	10.121.129.196/31	10.121.129.196 – 10.121.129.197	10.121.129.197
228	10.121.129.198/31	10.121.129.198 – 10.121.129.199	10.121.129.199
229	10.121.129.200/31	10.121.129.200 – 10.121.129.201	10.121.129.201
230	10.121.129.202/31	10.121.129.202 – 10.121.129.203	10.121.129.203
231	10.121.129.204/31	10.121.129.204 – 10.121.129.205	10.121.129.205
232	10.121.129.206/31	10.121.129.206 – 10.121.129.207	10.121.129.207
233	10.121.129.208/31	10.121.129.208 – 10.121.129.209	10.121.129.209
234	10.121.129.210/31	10.121.129.210 – 10.121.129.211	10.121.129.211
235	10.121.129.212/31	10.121.129.212 – 10.121.129.213	10.121.129.213
236	10.121.129.214/31	10.121.129.214 – 10.121.129.215	10.121.129.215
237	10.121.129.216/31	10.121.129.216 – 10.121.129.217	10.121.129.217
238	10.121.129.218/31	10.121.129.218 – 10.121.129.219	10.121.129.219
239	10.121.129.220/31	10.121.129.220 – 10.121.129.221	10.121.129.221
240	10.121.129.222/31	10.121.129.222 – 10.121.129.223	10.121.129.223
241	10.121.129.224/31	10.121.129.224 – 10.121.129.225	10.121.129.225
242	10.121.129.226/31	10.121.129.226 – 10.121.129.227	10.121.129.227
243	10.121.129.228/31	10.121.129.228 – 10.121.129.229	10.121.129.229
244	10.121.129.230/31	10.121.129.230 – 10.121.129.231	10.121.129.231
245	10.121.129.232/31	10.121.129.232 – 10.121.129.233	10.121.129.233
246	10.121.129.234/31	10.121.129.234 – 10.121.129.235	10.121.129.235
247	10.121.129.236/31	10.121.129.236 – 10.121.129.237	10.121.129.237
248	10.121.129.238/31	10.121.129.238 – 10.121.129.239	10.121.129.239
249	10.121.129.240/31	10.121.129.240 – 10.121.129.241	10.121.129.241
250	10.121.129.242/31	10.121.129.242 – 10.121.129.243	10.121.129.243
251	10.121.129.244/31	10.121.129.244 – 10.121.129.245	10.121.129.245
252	10.121.129.246/31	10.121.129.246 – 10.121.129.247	10.121.129.247
253	10.121.129.248/31	10.121.129.248 – 10.121.129.249	10.121.129.249
254	10.121.129.250/31	10.121.129.250 – 10.121.129.251	10.121.129.251
255	10.121.129.252/31	10.121.129.252 – 10.121.129.253	10.121.129.253
256	10.121.129.254/31	10.121.129.254 – 10.121.129.255	10.121.129.255

showing 256 of 16,384

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 →