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)10.2.64.0/18

network10.2.64.0/18

broadcast10.2.127.255

first host10.2.64.1

last host10.2.127.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.2.64.0/18

address00001010.00000010.01000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00000010.01000000.00000000

broadcast00001010.00000010.01111111.11111111

green = network part, grey = host part

hex0x0a024000

decimal167919616

reverse dns0.64.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4000

/18 split into /26 · 256 subnets

close ×

#	network	host range	broadcast
1	10.2.64.0/26	10.2.64.1 – 10.2.64.62	10.2.64.63
2	10.2.64.64/26	10.2.64.65 – 10.2.64.126	10.2.64.127
3	10.2.64.128/26	10.2.64.129 – 10.2.64.190	10.2.64.191
4	10.2.64.192/26	10.2.64.193 – 10.2.64.254	10.2.64.255
5	10.2.65.0/26	10.2.65.1 – 10.2.65.62	10.2.65.63
6	10.2.65.64/26	10.2.65.65 – 10.2.65.126	10.2.65.127
7	10.2.65.128/26	10.2.65.129 – 10.2.65.190	10.2.65.191
8	10.2.65.192/26	10.2.65.193 – 10.2.65.254	10.2.65.255
9	10.2.66.0/26	10.2.66.1 – 10.2.66.62	10.2.66.63
10	10.2.66.64/26	10.2.66.65 – 10.2.66.126	10.2.66.127
11	10.2.66.128/26	10.2.66.129 – 10.2.66.190	10.2.66.191
12	10.2.66.192/26	10.2.66.193 – 10.2.66.254	10.2.66.255
13	10.2.67.0/26	10.2.67.1 – 10.2.67.62	10.2.67.63
14	10.2.67.64/26	10.2.67.65 – 10.2.67.126	10.2.67.127
15	10.2.67.128/26	10.2.67.129 – 10.2.67.190	10.2.67.191
16	10.2.67.192/26	10.2.67.193 – 10.2.67.254	10.2.67.255
17	10.2.68.0/26	10.2.68.1 – 10.2.68.62	10.2.68.63
18	10.2.68.64/26	10.2.68.65 – 10.2.68.126	10.2.68.127
19	10.2.68.128/26	10.2.68.129 – 10.2.68.190	10.2.68.191
20	10.2.68.192/26	10.2.68.193 – 10.2.68.254	10.2.68.255
21	10.2.69.0/26	10.2.69.1 – 10.2.69.62	10.2.69.63
22	10.2.69.64/26	10.2.69.65 – 10.2.69.126	10.2.69.127
23	10.2.69.128/26	10.2.69.129 – 10.2.69.190	10.2.69.191
24	10.2.69.192/26	10.2.69.193 – 10.2.69.254	10.2.69.255
25	10.2.70.0/26	10.2.70.1 – 10.2.70.62	10.2.70.63
26	10.2.70.64/26	10.2.70.65 – 10.2.70.126	10.2.70.127
27	10.2.70.128/26	10.2.70.129 – 10.2.70.190	10.2.70.191
28	10.2.70.192/26	10.2.70.193 – 10.2.70.254	10.2.70.255
29	10.2.71.0/26	10.2.71.1 – 10.2.71.62	10.2.71.63
30	10.2.71.64/26	10.2.71.65 – 10.2.71.126	10.2.71.127
31	10.2.71.128/26	10.2.71.129 – 10.2.71.190	10.2.71.191
32	10.2.71.192/26	10.2.71.193 – 10.2.71.254	10.2.71.255
33	10.2.72.0/26	10.2.72.1 – 10.2.72.62	10.2.72.63
34	10.2.72.64/26	10.2.72.65 – 10.2.72.126	10.2.72.127
35	10.2.72.128/26	10.2.72.129 – 10.2.72.190	10.2.72.191
36	10.2.72.192/26	10.2.72.193 – 10.2.72.254	10.2.72.255
37	10.2.73.0/26	10.2.73.1 – 10.2.73.62	10.2.73.63
38	10.2.73.64/26	10.2.73.65 – 10.2.73.126	10.2.73.127
39	10.2.73.128/26	10.2.73.129 – 10.2.73.190	10.2.73.191
40	10.2.73.192/26	10.2.73.193 – 10.2.73.254	10.2.73.255
41	10.2.74.0/26	10.2.74.1 – 10.2.74.62	10.2.74.63
42	10.2.74.64/26	10.2.74.65 – 10.2.74.126	10.2.74.127
43	10.2.74.128/26	10.2.74.129 – 10.2.74.190	10.2.74.191
44	10.2.74.192/26	10.2.74.193 – 10.2.74.254	10.2.74.255
45	10.2.75.0/26	10.2.75.1 – 10.2.75.62	10.2.75.63
46	10.2.75.64/26	10.2.75.65 – 10.2.75.126	10.2.75.127
47	10.2.75.128/26	10.2.75.129 – 10.2.75.190	10.2.75.191
48	10.2.75.192/26	10.2.75.193 – 10.2.75.254	10.2.75.255
49	10.2.76.0/26	10.2.76.1 – 10.2.76.62	10.2.76.63
50	10.2.76.64/26	10.2.76.65 – 10.2.76.126	10.2.76.127
51	10.2.76.128/26	10.2.76.129 – 10.2.76.190	10.2.76.191
52	10.2.76.192/26	10.2.76.193 – 10.2.76.254	10.2.76.255
53	10.2.77.0/26	10.2.77.1 – 10.2.77.62	10.2.77.63
54	10.2.77.64/26	10.2.77.65 – 10.2.77.126	10.2.77.127
55	10.2.77.128/26	10.2.77.129 – 10.2.77.190	10.2.77.191
56	10.2.77.192/26	10.2.77.193 – 10.2.77.254	10.2.77.255
57	10.2.78.0/26	10.2.78.1 – 10.2.78.62	10.2.78.63
58	10.2.78.64/26	10.2.78.65 – 10.2.78.126	10.2.78.127
59	10.2.78.128/26	10.2.78.129 – 10.2.78.190	10.2.78.191
60	10.2.78.192/26	10.2.78.193 – 10.2.78.254	10.2.78.255
61	10.2.79.0/26	10.2.79.1 – 10.2.79.62	10.2.79.63
62	10.2.79.64/26	10.2.79.65 – 10.2.79.126	10.2.79.127
63	10.2.79.128/26	10.2.79.129 – 10.2.79.190	10.2.79.191
64	10.2.79.192/26	10.2.79.193 – 10.2.79.254	10.2.79.255
65	10.2.80.0/26	10.2.80.1 – 10.2.80.62	10.2.80.63
66	10.2.80.64/26	10.2.80.65 – 10.2.80.126	10.2.80.127
67	10.2.80.128/26	10.2.80.129 – 10.2.80.190	10.2.80.191
68	10.2.80.192/26	10.2.80.193 – 10.2.80.254	10.2.80.255
69	10.2.81.0/26	10.2.81.1 – 10.2.81.62	10.2.81.63
70	10.2.81.64/26	10.2.81.65 – 10.2.81.126	10.2.81.127
71	10.2.81.128/26	10.2.81.129 – 10.2.81.190	10.2.81.191
72	10.2.81.192/26	10.2.81.193 – 10.2.81.254	10.2.81.255
73	10.2.82.0/26	10.2.82.1 – 10.2.82.62	10.2.82.63
74	10.2.82.64/26	10.2.82.65 – 10.2.82.126	10.2.82.127
75	10.2.82.128/26	10.2.82.129 – 10.2.82.190	10.2.82.191
76	10.2.82.192/26	10.2.82.193 – 10.2.82.254	10.2.82.255
77	10.2.83.0/26	10.2.83.1 – 10.2.83.62	10.2.83.63
78	10.2.83.64/26	10.2.83.65 – 10.2.83.126	10.2.83.127
79	10.2.83.128/26	10.2.83.129 – 10.2.83.190	10.2.83.191
80	10.2.83.192/26	10.2.83.193 – 10.2.83.254	10.2.83.255
81	10.2.84.0/26	10.2.84.1 – 10.2.84.62	10.2.84.63
82	10.2.84.64/26	10.2.84.65 – 10.2.84.126	10.2.84.127
83	10.2.84.128/26	10.2.84.129 – 10.2.84.190	10.2.84.191
84	10.2.84.192/26	10.2.84.193 – 10.2.84.254	10.2.84.255
85	10.2.85.0/26	10.2.85.1 – 10.2.85.62	10.2.85.63
86	10.2.85.64/26	10.2.85.65 – 10.2.85.126	10.2.85.127
87	10.2.85.128/26	10.2.85.129 – 10.2.85.190	10.2.85.191
88	10.2.85.192/26	10.2.85.193 – 10.2.85.254	10.2.85.255
89	10.2.86.0/26	10.2.86.1 – 10.2.86.62	10.2.86.63
90	10.2.86.64/26	10.2.86.65 – 10.2.86.126	10.2.86.127
91	10.2.86.128/26	10.2.86.129 – 10.2.86.190	10.2.86.191
92	10.2.86.192/26	10.2.86.193 – 10.2.86.254	10.2.86.255
93	10.2.87.0/26	10.2.87.1 – 10.2.87.62	10.2.87.63
94	10.2.87.64/26	10.2.87.65 – 10.2.87.126	10.2.87.127
95	10.2.87.128/26	10.2.87.129 – 10.2.87.190	10.2.87.191
96	10.2.87.192/26	10.2.87.193 – 10.2.87.254	10.2.87.255
97	10.2.88.0/26	10.2.88.1 – 10.2.88.62	10.2.88.63
98	10.2.88.64/26	10.2.88.65 – 10.2.88.126	10.2.88.127
99	10.2.88.128/26	10.2.88.129 – 10.2.88.190	10.2.88.191
100	10.2.88.192/26	10.2.88.193 – 10.2.88.254	10.2.88.255
101	10.2.89.0/26	10.2.89.1 – 10.2.89.62	10.2.89.63
102	10.2.89.64/26	10.2.89.65 – 10.2.89.126	10.2.89.127
103	10.2.89.128/26	10.2.89.129 – 10.2.89.190	10.2.89.191
104	10.2.89.192/26	10.2.89.193 – 10.2.89.254	10.2.89.255
105	10.2.90.0/26	10.2.90.1 – 10.2.90.62	10.2.90.63
106	10.2.90.64/26	10.2.90.65 – 10.2.90.126	10.2.90.127
107	10.2.90.128/26	10.2.90.129 – 10.2.90.190	10.2.90.191
108	10.2.90.192/26	10.2.90.193 – 10.2.90.254	10.2.90.255
109	10.2.91.0/26	10.2.91.1 – 10.2.91.62	10.2.91.63
110	10.2.91.64/26	10.2.91.65 – 10.2.91.126	10.2.91.127
111	10.2.91.128/26	10.2.91.129 – 10.2.91.190	10.2.91.191
112	10.2.91.192/26	10.2.91.193 – 10.2.91.254	10.2.91.255
113	10.2.92.0/26	10.2.92.1 – 10.2.92.62	10.2.92.63
114	10.2.92.64/26	10.2.92.65 – 10.2.92.126	10.2.92.127
115	10.2.92.128/26	10.2.92.129 – 10.2.92.190	10.2.92.191
116	10.2.92.192/26	10.2.92.193 – 10.2.92.254	10.2.92.255
117	10.2.93.0/26	10.2.93.1 – 10.2.93.62	10.2.93.63
118	10.2.93.64/26	10.2.93.65 – 10.2.93.126	10.2.93.127
119	10.2.93.128/26	10.2.93.129 – 10.2.93.190	10.2.93.191
120	10.2.93.192/26	10.2.93.193 – 10.2.93.254	10.2.93.255
121	10.2.94.0/26	10.2.94.1 – 10.2.94.62	10.2.94.63
122	10.2.94.64/26	10.2.94.65 – 10.2.94.126	10.2.94.127
123	10.2.94.128/26	10.2.94.129 – 10.2.94.190	10.2.94.191
124	10.2.94.192/26	10.2.94.193 – 10.2.94.254	10.2.94.255
125	10.2.95.0/26	10.2.95.1 – 10.2.95.62	10.2.95.63
126	10.2.95.64/26	10.2.95.65 – 10.2.95.126	10.2.95.127
127	10.2.95.128/26	10.2.95.129 – 10.2.95.190	10.2.95.191
128	10.2.95.192/26	10.2.95.193 – 10.2.95.254	10.2.95.255
129	10.2.96.0/26	10.2.96.1 – 10.2.96.62	10.2.96.63
130	10.2.96.64/26	10.2.96.65 – 10.2.96.126	10.2.96.127
131	10.2.96.128/26	10.2.96.129 – 10.2.96.190	10.2.96.191
132	10.2.96.192/26	10.2.96.193 – 10.2.96.254	10.2.96.255
133	10.2.97.0/26	10.2.97.1 – 10.2.97.62	10.2.97.63
134	10.2.97.64/26	10.2.97.65 – 10.2.97.126	10.2.97.127
135	10.2.97.128/26	10.2.97.129 – 10.2.97.190	10.2.97.191
136	10.2.97.192/26	10.2.97.193 – 10.2.97.254	10.2.97.255
137	10.2.98.0/26	10.2.98.1 – 10.2.98.62	10.2.98.63
138	10.2.98.64/26	10.2.98.65 – 10.2.98.126	10.2.98.127
139	10.2.98.128/26	10.2.98.129 – 10.2.98.190	10.2.98.191
140	10.2.98.192/26	10.2.98.193 – 10.2.98.254	10.2.98.255
141	10.2.99.0/26	10.2.99.1 – 10.2.99.62	10.2.99.63
142	10.2.99.64/26	10.2.99.65 – 10.2.99.126	10.2.99.127
143	10.2.99.128/26	10.2.99.129 – 10.2.99.190	10.2.99.191
144	10.2.99.192/26	10.2.99.193 – 10.2.99.254	10.2.99.255
145	10.2.100.0/26	10.2.100.1 – 10.2.100.62	10.2.100.63
146	10.2.100.64/26	10.2.100.65 – 10.2.100.126	10.2.100.127
147	10.2.100.128/26	10.2.100.129 – 10.2.100.190	10.2.100.191
148	10.2.100.192/26	10.2.100.193 – 10.2.100.254	10.2.100.255
149	10.2.101.0/26	10.2.101.1 – 10.2.101.62	10.2.101.63
150	10.2.101.64/26	10.2.101.65 – 10.2.101.126	10.2.101.127
151	10.2.101.128/26	10.2.101.129 – 10.2.101.190	10.2.101.191
152	10.2.101.192/26	10.2.101.193 – 10.2.101.254	10.2.101.255
153	10.2.102.0/26	10.2.102.1 – 10.2.102.62	10.2.102.63
154	10.2.102.64/26	10.2.102.65 – 10.2.102.126	10.2.102.127
155	10.2.102.128/26	10.2.102.129 – 10.2.102.190	10.2.102.191
156	10.2.102.192/26	10.2.102.193 – 10.2.102.254	10.2.102.255
157	10.2.103.0/26	10.2.103.1 – 10.2.103.62	10.2.103.63
158	10.2.103.64/26	10.2.103.65 – 10.2.103.126	10.2.103.127
159	10.2.103.128/26	10.2.103.129 – 10.2.103.190	10.2.103.191
160	10.2.103.192/26	10.2.103.193 – 10.2.103.254	10.2.103.255
161	10.2.104.0/26	10.2.104.1 – 10.2.104.62	10.2.104.63
162	10.2.104.64/26	10.2.104.65 – 10.2.104.126	10.2.104.127
163	10.2.104.128/26	10.2.104.129 – 10.2.104.190	10.2.104.191
164	10.2.104.192/26	10.2.104.193 – 10.2.104.254	10.2.104.255
165	10.2.105.0/26	10.2.105.1 – 10.2.105.62	10.2.105.63
166	10.2.105.64/26	10.2.105.65 – 10.2.105.126	10.2.105.127
167	10.2.105.128/26	10.2.105.129 – 10.2.105.190	10.2.105.191
168	10.2.105.192/26	10.2.105.193 – 10.2.105.254	10.2.105.255
169	10.2.106.0/26	10.2.106.1 – 10.2.106.62	10.2.106.63
170	10.2.106.64/26	10.2.106.65 – 10.2.106.126	10.2.106.127
171	10.2.106.128/26	10.2.106.129 – 10.2.106.190	10.2.106.191
172	10.2.106.192/26	10.2.106.193 – 10.2.106.254	10.2.106.255
173	10.2.107.0/26	10.2.107.1 – 10.2.107.62	10.2.107.63
174	10.2.107.64/26	10.2.107.65 – 10.2.107.126	10.2.107.127
175	10.2.107.128/26	10.2.107.129 – 10.2.107.190	10.2.107.191
176	10.2.107.192/26	10.2.107.193 – 10.2.107.254	10.2.107.255
177	10.2.108.0/26	10.2.108.1 – 10.2.108.62	10.2.108.63
178	10.2.108.64/26	10.2.108.65 – 10.2.108.126	10.2.108.127
179	10.2.108.128/26	10.2.108.129 – 10.2.108.190	10.2.108.191
180	10.2.108.192/26	10.2.108.193 – 10.2.108.254	10.2.108.255
181	10.2.109.0/26	10.2.109.1 – 10.2.109.62	10.2.109.63
182	10.2.109.64/26	10.2.109.65 – 10.2.109.126	10.2.109.127
183	10.2.109.128/26	10.2.109.129 – 10.2.109.190	10.2.109.191
184	10.2.109.192/26	10.2.109.193 – 10.2.109.254	10.2.109.255
185	10.2.110.0/26	10.2.110.1 – 10.2.110.62	10.2.110.63
186	10.2.110.64/26	10.2.110.65 – 10.2.110.126	10.2.110.127
187	10.2.110.128/26	10.2.110.129 – 10.2.110.190	10.2.110.191
188	10.2.110.192/26	10.2.110.193 – 10.2.110.254	10.2.110.255
189	10.2.111.0/26	10.2.111.1 – 10.2.111.62	10.2.111.63
190	10.2.111.64/26	10.2.111.65 – 10.2.111.126	10.2.111.127
191	10.2.111.128/26	10.2.111.129 – 10.2.111.190	10.2.111.191
192	10.2.111.192/26	10.2.111.193 – 10.2.111.254	10.2.111.255
193	10.2.112.0/26	10.2.112.1 – 10.2.112.62	10.2.112.63
194	10.2.112.64/26	10.2.112.65 – 10.2.112.126	10.2.112.127
195	10.2.112.128/26	10.2.112.129 – 10.2.112.190	10.2.112.191
196	10.2.112.192/26	10.2.112.193 – 10.2.112.254	10.2.112.255
197	10.2.113.0/26	10.2.113.1 – 10.2.113.62	10.2.113.63
198	10.2.113.64/26	10.2.113.65 – 10.2.113.126	10.2.113.127
199	10.2.113.128/26	10.2.113.129 – 10.2.113.190	10.2.113.191
200	10.2.113.192/26	10.2.113.193 – 10.2.113.254	10.2.113.255
201	10.2.114.0/26	10.2.114.1 – 10.2.114.62	10.2.114.63
202	10.2.114.64/26	10.2.114.65 – 10.2.114.126	10.2.114.127
203	10.2.114.128/26	10.2.114.129 – 10.2.114.190	10.2.114.191
204	10.2.114.192/26	10.2.114.193 – 10.2.114.254	10.2.114.255
205	10.2.115.0/26	10.2.115.1 – 10.2.115.62	10.2.115.63
206	10.2.115.64/26	10.2.115.65 – 10.2.115.126	10.2.115.127
207	10.2.115.128/26	10.2.115.129 – 10.2.115.190	10.2.115.191
208	10.2.115.192/26	10.2.115.193 – 10.2.115.254	10.2.115.255
209	10.2.116.0/26	10.2.116.1 – 10.2.116.62	10.2.116.63
210	10.2.116.64/26	10.2.116.65 – 10.2.116.126	10.2.116.127
211	10.2.116.128/26	10.2.116.129 – 10.2.116.190	10.2.116.191
212	10.2.116.192/26	10.2.116.193 – 10.2.116.254	10.2.116.255
213	10.2.117.0/26	10.2.117.1 – 10.2.117.62	10.2.117.63
214	10.2.117.64/26	10.2.117.65 – 10.2.117.126	10.2.117.127
215	10.2.117.128/26	10.2.117.129 – 10.2.117.190	10.2.117.191
216	10.2.117.192/26	10.2.117.193 – 10.2.117.254	10.2.117.255
217	10.2.118.0/26	10.2.118.1 – 10.2.118.62	10.2.118.63
218	10.2.118.64/26	10.2.118.65 – 10.2.118.126	10.2.118.127
219	10.2.118.128/26	10.2.118.129 – 10.2.118.190	10.2.118.191
220	10.2.118.192/26	10.2.118.193 – 10.2.118.254	10.2.118.255
221	10.2.119.0/26	10.2.119.1 – 10.2.119.62	10.2.119.63
222	10.2.119.64/26	10.2.119.65 – 10.2.119.126	10.2.119.127
223	10.2.119.128/26	10.2.119.129 – 10.2.119.190	10.2.119.191
224	10.2.119.192/26	10.2.119.193 – 10.2.119.254	10.2.119.255
225	10.2.120.0/26	10.2.120.1 – 10.2.120.62	10.2.120.63
226	10.2.120.64/26	10.2.120.65 – 10.2.120.126	10.2.120.127
227	10.2.120.128/26	10.2.120.129 – 10.2.120.190	10.2.120.191
228	10.2.120.192/26	10.2.120.193 – 10.2.120.254	10.2.120.255
229	10.2.121.0/26	10.2.121.1 – 10.2.121.62	10.2.121.63
230	10.2.121.64/26	10.2.121.65 – 10.2.121.126	10.2.121.127
231	10.2.121.128/26	10.2.121.129 – 10.2.121.190	10.2.121.191
232	10.2.121.192/26	10.2.121.193 – 10.2.121.254	10.2.121.255
233	10.2.122.0/26	10.2.122.1 – 10.2.122.62	10.2.122.63
234	10.2.122.64/26	10.2.122.65 – 10.2.122.126	10.2.122.127
235	10.2.122.128/26	10.2.122.129 – 10.2.122.190	10.2.122.191
236	10.2.122.192/26	10.2.122.193 – 10.2.122.254	10.2.122.255
237	10.2.123.0/26	10.2.123.1 – 10.2.123.62	10.2.123.63
238	10.2.123.64/26	10.2.123.65 – 10.2.123.126	10.2.123.127
239	10.2.123.128/26	10.2.123.129 – 10.2.123.190	10.2.123.191
240	10.2.123.192/26	10.2.123.193 – 10.2.123.254	10.2.123.255
241	10.2.124.0/26	10.2.124.1 – 10.2.124.62	10.2.124.63
242	10.2.124.64/26	10.2.124.65 – 10.2.124.126	10.2.124.127
243	10.2.124.128/26	10.2.124.129 – 10.2.124.190	10.2.124.191
244	10.2.124.192/26	10.2.124.193 – 10.2.124.254	10.2.124.255
245	10.2.125.0/26	10.2.125.1 – 10.2.125.62	10.2.125.63
246	10.2.125.64/26	10.2.125.65 – 10.2.125.126	10.2.125.127
247	10.2.125.128/26	10.2.125.129 – 10.2.125.190	10.2.125.191
248	10.2.125.192/26	10.2.125.193 – 10.2.125.254	10.2.125.255
249	10.2.126.0/26	10.2.126.1 – 10.2.126.62	10.2.126.63
250	10.2.126.64/26	10.2.126.65 – 10.2.126.126	10.2.126.127
251	10.2.126.128/26	10.2.126.129 – 10.2.126.190	10.2.126.191
252	10.2.126.192/26	10.2.126.193 – 10.2.126.254	10.2.126.255
253	10.2.127.0/26	10.2.127.1 – 10.2.127.62	10.2.127.63
254	10.2.127.64/26	10.2.127.65 – 10.2.127.126	10.2.127.127
255	10.2.127.128/26	10.2.127.129 – 10.2.127.190	10.2.127.191
256	10.2.127.192/26	10.2.127.193 – 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 /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 →