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)10.20.64.0/19

network10.20.64.0/19

broadcast10.20.95.255

first host10.20.64.1

last host10.20.95.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.20.64.0/19

address00001010.00010100.01000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.00010100.01000000.00000000

broadcast00001010.00010100.01011111.11111111

green = network part, grey = host part

hex0x0a144000

decimal169099264

reverse dns0.64.20.10.in-addr.arpa

ipv4-mapped::ffff:a14:4000

/19 split into /27 · 256 subnets

close ×

#	network	host range	broadcast
1	10.20.64.0/27	10.20.64.1 – 10.20.64.30	10.20.64.31
2	10.20.64.32/27	10.20.64.33 – 10.20.64.62	10.20.64.63
3	10.20.64.64/27	10.20.64.65 – 10.20.64.94	10.20.64.95
4	10.20.64.96/27	10.20.64.97 – 10.20.64.126	10.20.64.127
5	10.20.64.128/27	10.20.64.129 – 10.20.64.158	10.20.64.159
6	10.20.64.160/27	10.20.64.161 – 10.20.64.190	10.20.64.191
7	10.20.64.192/27	10.20.64.193 – 10.20.64.222	10.20.64.223
8	10.20.64.224/27	10.20.64.225 – 10.20.64.254	10.20.64.255
9	10.20.65.0/27	10.20.65.1 – 10.20.65.30	10.20.65.31
10	10.20.65.32/27	10.20.65.33 – 10.20.65.62	10.20.65.63
11	10.20.65.64/27	10.20.65.65 – 10.20.65.94	10.20.65.95
12	10.20.65.96/27	10.20.65.97 – 10.20.65.126	10.20.65.127
13	10.20.65.128/27	10.20.65.129 – 10.20.65.158	10.20.65.159
14	10.20.65.160/27	10.20.65.161 – 10.20.65.190	10.20.65.191
15	10.20.65.192/27	10.20.65.193 – 10.20.65.222	10.20.65.223
16	10.20.65.224/27	10.20.65.225 – 10.20.65.254	10.20.65.255
17	10.20.66.0/27	10.20.66.1 – 10.20.66.30	10.20.66.31
18	10.20.66.32/27	10.20.66.33 – 10.20.66.62	10.20.66.63
19	10.20.66.64/27	10.20.66.65 – 10.20.66.94	10.20.66.95
20	10.20.66.96/27	10.20.66.97 – 10.20.66.126	10.20.66.127
21	10.20.66.128/27	10.20.66.129 – 10.20.66.158	10.20.66.159
22	10.20.66.160/27	10.20.66.161 – 10.20.66.190	10.20.66.191
23	10.20.66.192/27	10.20.66.193 – 10.20.66.222	10.20.66.223
24	10.20.66.224/27	10.20.66.225 – 10.20.66.254	10.20.66.255
25	10.20.67.0/27	10.20.67.1 – 10.20.67.30	10.20.67.31
26	10.20.67.32/27	10.20.67.33 – 10.20.67.62	10.20.67.63
27	10.20.67.64/27	10.20.67.65 – 10.20.67.94	10.20.67.95
28	10.20.67.96/27	10.20.67.97 – 10.20.67.126	10.20.67.127
29	10.20.67.128/27	10.20.67.129 – 10.20.67.158	10.20.67.159
30	10.20.67.160/27	10.20.67.161 – 10.20.67.190	10.20.67.191
31	10.20.67.192/27	10.20.67.193 – 10.20.67.222	10.20.67.223
32	10.20.67.224/27	10.20.67.225 – 10.20.67.254	10.20.67.255
33	10.20.68.0/27	10.20.68.1 – 10.20.68.30	10.20.68.31
34	10.20.68.32/27	10.20.68.33 – 10.20.68.62	10.20.68.63
35	10.20.68.64/27	10.20.68.65 – 10.20.68.94	10.20.68.95
36	10.20.68.96/27	10.20.68.97 – 10.20.68.126	10.20.68.127
37	10.20.68.128/27	10.20.68.129 – 10.20.68.158	10.20.68.159
38	10.20.68.160/27	10.20.68.161 – 10.20.68.190	10.20.68.191
39	10.20.68.192/27	10.20.68.193 – 10.20.68.222	10.20.68.223
40	10.20.68.224/27	10.20.68.225 – 10.20.68.254	10.20.68.255
41	10.20.69.0/27	10.20.69.1 – 10.20.69.30	10.20.69.31
42	10.20.69.32/27	10.20.69.33 – 10.20.69.62	10.20.69.63
43	10.20.69.64/27	10.20.69.65 – 10.20.69.94	10.20.69.95
44	10.20.69.96/27	10.20.69.97 – 10.20.69.126	10.20.69.127
45	10.20.69.128/27	10.20.69.129 – 10.20.69.158	10.20.69.159
46	10.20.69.160/27	10.20.69.161 – 10.20.69.190	10.20.69.191
47	10.20.69.192/27	10.20.69.193 – 10.20.69.222	10.20.69.223
48	10.20.69.224/27	10.20.69.225 – 10.20.69.254	10.20.69.255
49	10.20.70.0/27	10.20.70.1 – 10.20.70.30	10.20.70.31
50	10.20.70.32/27	10.20.70.33 – 10.20.70.62	10.20.70.63
51	10.20.70.64/27	10.20.70.65 – 10.20.70.94	10.20.70.95
52	10.20.70.96/27	10.20.70.97 – 10.20.70.126	10.20.70.127
53	10.20.70.128/27	10.20.70.129 – 10.20.70.158	10.20.70.159
54	10.20.70.160/27	10.20.70.161 – 10.20.70.190	10.20.70.191
55	10.20.70.192/27	10.20.70.193 – 10.20.70.222	10.20.70.223
56	10.20.70.224/27	10.20.70.225 – 10.20.70.254	10.20.70.255
57	10.20.71.0/27	10.20.71.1 – 10.20.71.30	10.20.71.31
58	10.20.71.32/27	10.20.71.33 – 10.20.71.62	10.20.71.63
59	10.20.71.64/27	10.20.71.65 – 10.20.71.94	10.20.71.95
60	10.20.71.96/27	10.20.71.97 – 10.20.71.126	10.20.71.127
61	10.20.71.128/27	10.20.71.129 – 10.20.71.158	10.20.71.159
62	10.20.71.160/27	10.20.71.161 – 10.20.71.190	10.20.71.191
63	10.20.71.192/27	10.20.71.193 – 10.20.71.222	10.20.71.223
64	10.20.71.224/27	10.20.71.225 – 10.20.71.254	10.20.71.255
65	10.20.72.0/27	10.20.72.1 – 10.20.72.30	10.20.72.31
66	10.20.72.32/27	10.20.72.33 – 10.20.72.62	10.20.72.63
67	10.20.72.64/27	10.20.72.65 – 10.20.72.94	10.20.72.95
68	10.20.72.96/27	10.20.72.97 – 10.20.72.126	10.20.72.127
69	10.20.72.128/27	10.20.72.129 – 10.20.72.158	10.20.72.159
70	10.20.72.160/27	10.20.72.161 – 10.20.72.190	10.20.72.191
71	10.20.72.192/27	10.20.72.193 – 10.20.72.222	10.20.72.223
72	10.20.72.224/27	10.20.72.225 – 10.20.72.254	10.20.72.255
73	10.20.73.0/27	10.20.73.1 – 10.20.73.30	10.20.73.31
74	10.20.73.32/27	10.20.73.33 – 10.20.73.62	10.20.73.63
75	10.20.73.64/27	10.20.73.65 – 10.20.73.94	10.20.73.95
76	10.20.73.96/27	10.20.73.97 – 10.20.73.126	10.20.73.127
77	10.20.73.128/27	10.20.73.129 – 10.20.73.158	10.20.73.159
78	10.20.73.160/27	10.20.73.161 – 10.20.73.190	10.20.73.191
79	10.20.73.192/27	10.20.73.193 – 10.20.73.222	10.20.73.223
80	10.20.73.224/27	10.20.73.225 – 10.20.73.254	10.20.73.255
81	10.20.74.0/27	10.20.74.1 – 10.20.74.30	10.20.74.31
82	10.20.74.32/27	10.20.74.33 – 10.20.74.62	10.20.74.63
83	10.20.74.64/27	10.20.74.65 – 10.20.74.94	10.20.74.95
84	10.20.74.96/27	10.20.74.97 – 10.20.74.126	10.20.74.127
85	10.20.74.128/27	10.20.74.129 – 10.20.74.158	10.20.74.159
86	10.20.74.160/27	10.20.74.161 – 10.20.74.190	10.20.74.191
87	10.20.74.192/27	10.20.74.193 – 10.20.74.222	10.20.74.223
88	10.20.74.224/27	10.20.74.225 – 10.20.74.254	10.20.74.255
89	10.20.75.0/27	10.20.75.1 – 10.20.75.30	10.20.75.31
90	10.20.75.32/27	10.20.75.33 – 10.20.75.62	10.20.75.63
91	10.20.75.64/27	10.20.75.65 – 10.20.75.94	10.20.75.95
92	10.20.75.96/27	10.20.75.97 – 10.20.75.126	10.20.75.127
93	10.20.75.128/27	10.20.75.129 – 10.20.75.158	10.20.75.159
94	10.20.75.160/27	10.20.75.161 – 10.20.75.190	10.20.75.191
95	10.20.75.192/27	10.20.75.193 – 10.20.75.222	10.20.75.223
96	10.20.75.224/27	10.20.75.225 – 10.20.75.254	10.20.75.255
97	10.20.76.0/27	10.20.76.1 – 10.20.76.30	10.20.76.31
98	10.20.76.32/27	10.20.76.33 – 10.20.76.62	10.20.76.63
99	10.20.76.64/27	10.20.76.65 – 10.20.76.94	10.20.76.95
100	10.20.76.96/27	10.20.76.97 – 10.20.76.126	10.20.76.127
101	10.20.76.128/27	10.20.76.129 – 10.20.76.158	10.20.76.159
102	10.20.76.160/27	10.20.76.161 – 10.20.76.190	10.20.76.191
103	10.20.76.192/27	10.20.76.193 – 10.20.76.222	10.20.76.223
104	10.20.76.224/27	10.20.76.225 – 10.20.76.254	10.20.76.255
105	10.20.77.0/27	10.20.77.1 – 10.20.77.30	10.20.77.31
106	10.20.77.32/27	10.20.77.33 – 10.20.77.62	10.20.77.63
107	10.20.77.64/27	10.20.77.65 – 10.20.77.94	10.20.77.95
108	10.20.77.96/27	10.20.77.97 – 10.20.77.126	10.20.77.127
109	10.20.77.128/27	10.20.77.129 – 10.20.77.158	10.20.77.159
110	10.20.77.160/27	10.20.77.161 – 10.20.77.190	10.20.77.191
111	10.20.77.192/27	10.20.77.193 – 10.20.77.222	10.20.77.223
112	10.20.77.224/27	10.20.77.225 – 10.20.77.254	10.20.77.255
113	10.20.78.0/27	10.20.78.1 – 10.20.78.30	10.20.78.31
114	10.20.78.32/27	10.20.78.33 – 10.20.78.62	10.20.78.63
115	10.20.78.64/27	10.20.78.65 – 10.20.78.94	10.20.78.95
116	10.20.78.96/27	10.20.78.97 – 10.20.78.126	10.20.78.127
117	10.20.78.128/27	10.20.78.129 – 10.20.78.158	10.20.78.159
118	10.20.78.160/27	10.20.78.161 – 10.20.78.190	10.20.78.191
119	10.20.78.192/27	10.20.78.193 – 10.20.78.222	10.20.78.223
120	10.20.78.224/27	10.20.78.225 – 10.20.78.254	10.20.78.255
121	10.20.79.0/27	10.20.79.1 – 10.20.79.30	10.20.79.31
122	10.20.79.32/27	10.20.79.33 – 10.20.79.62	10.20.79.63
123	10.20.79.64/27	10.20.79.65 – 10.20.79.94	10.20.79.95
124	10.20.79.96/27	10.20.79.97 – 10.20.79.126	10.20.79.127
125	10.20.79.128/27	10.20.79.129 – 10.20.79.158	10.20.79.159
126	10.20.79.160/27	10.20.79.161 – 10.20.79.190	10.20.79.191
127	10.20.79.192/27	10.20.79.193 – 10.20.79.222	10.20.79.223
128	10.20.79.224/27	10.20.79.225 – 10.20.79.254	10.20.79.255
129	10.20.80.0/27	10.20.80.1 – 10.20.80.30	10.20.80.31
130	10.20.80.32/27	10.20.80.33 – 10.20.80.62	10.20.80.63
131	10.20.80.64/27	10.20.80.65 – 10.20.80.94	10.20.80.95
132	10.20.80.96/27	10.20.80.97 – 10.20.80.126	10.20.80.127
133	10.20.80.128/27	10.20.80.129 – 10.20.80.158	10.20.80.159
134	10.20.80.160/27	10.20.80.161 – 10.20.80.190	10.20.80.191
135	10.20.80.192/27	10.20.80.193 – 10.20.80.222	10.20.80.223
136	10.20.80.224/27	10.20.80.225 – 10.20.80.254	10.20.80.255
137	10.20.81.0/27	10.20.81.1 – 10.20.81.30	10.20.81.31
138	10.20.81.32/27	10.20.81.33 – 10.20.81.62	10.20.81.63
139	10.20.81.64/27	10.20.81.65 – 10.20.81.94	10.20.81.95
140	10.20.81.96/27	10.20.81.97 – 10.20.81.126	10.20.81.127
141	10.20.81.128/27	10.20.81.129 – 10.20.81.158	10.20.81.159
142	10.20.81.160/27	10.20.81.161 – 10.20.81.190	10.20.81.191
143	10.20.81.192/27	10.20.81.193 – 10.20.81.222	10.20.81.223
144	10.20.81.224/27	10.20.81.225 – 10.20.81.254	10.20.81.255
145	10.20.82.0/27	10.20.82.1 – 10.20.82.30	10.20.82.31
146	10.20.82.32/27	10.20.82.33 – 10.20.82.62	10.20.82.63
147	10.20.82.64/27	10.20.82.65 – 10.20.82.94	10.20.82.95
148	10.20.82.96/27	10.20.82.97 – 10.20.82.126	10.20.82.127
149	10.20.82.128/27	10.20.82.129 – 10.20.82.158	10.20.82.159
150	10.20.82.160/27	10.20.82.161 – 10.20.82.190	10.20.82.191
151	10.20.82.192/27	10.20.82.193 – 10.20.82.222	10.20.82.223
152	10.20.82.224/27	10.20.82.225 – 10.20.82.254	10.20.82.255
153	10.20.83.0/27	10.20.83.1 – 10.20.83.30	10.20.83.31
154	10.20.83.32/27	10.20.83.33 – 10.20.83.62	10.20.83.63
155	10.20.83.64/27	10.20.83.65 – 10.20.83.94	10.20.83.95
156	10.20.83.96/27	10.20.83.97 – 10.20.83.126	10.20.83.127
157	10.20.83.128/27	10.20.83.129 – 10.20.83.158	10.20.83.159
158	10.20.83.160/27	10.20.83.161 – 10.20.83.190	10.20.83.191
159	10.20.83.192/27	10.20.83.193 – 10.20.83.222	10.20.83.223
160	10.20.83.224/27	10.20.83.225 – 10.20.83.254	10.20.83.255
161	10.20.84.0/27	10.20.84.1 – 10.20.84.30	10.20.84.31
162	10.20.84.32/27	10.20.84.33 – 10.20.84.62	10.20.84.63
163	10.20.84.64/27	10.20.84.65 – 10.20.84.94	10.20.84.95
164	10.20.84.96/27	10.20.84.97 – 10.20.84.126	10.20.84.127
165	10.20.84.128/27	10.20.84.129 – 10.20.84.158	10.20.84.159
166	10.20.84.160/27	10.20.84.161 – 10.20.84.190	10.20.84.191
167	10.20.84.192/27	10.20.84.193 – 10.20.84.222	10.20.84.223
168	10.20.84.224/27	10.20.84.225 – 10.20.84.254	10.20.84.255
169	10.20.85.0/27	10.20.85.1 – 10.20.85.30	10.20.85.31
170	10.20.85.32/27	10.20.85.33 – 10.20.85.62	10.20.85.63
171	10.20.85.64/27	10.20.85.65 – 10.20.85.94	10.20.85.95
172	10.20.85.96/27	10.20.85.97 – 10.20.85.126	10.20.85.127
173	10.20.85.128/27	10.20.85.129 – 10.20.85.158	10.20.85.159
174	10.20.85.160/27	10.20.85.161 – 10.20.85.190	10.20.85.191
175	10.20.85.192/27	10.20.85.193 – 10.20.85.222	10.20.85.223
176	10.20.85.224/27	10.20.85.225 – 10.20.85.254	10.20.85.255
177	10.20.86.0/27	10.20.86.1 – 10.20.86.30	10.20.86.31
178	10.20.86.32/27	10.20.86.33 – 10.20.86.62	10.20.86.63
179	10.20.86.64/27	10.20.86.65 – 10.20.86.94	10.20.86.95
180	10.20.86.96/27	10.20.86.97 – 10.20.86.126	10.20.86.127
181	10.20.86.128/27	10.20.86.129 – 10.20.86.158	10.20.86.159
182	10.20.86.160/27	10.20.86.161 – 10.20.86.190	10.20.86.191
183	10.20.86.192/27	10.20.86.193 – 10.20.86.222	10.20.86.223
184	10.20.86.224/27	10.20.86.225 – 10.20.86.254	10.20.86.255
185	10.20.87.0/27	10.20.87.1 – 10.20.87.30	10.20.87.31
186	10.20.87.32/27	10.20.87.33 – 10.20.87.62	10.20.87.63
187	10.20.87.64/27	10.20.87.65 – 10.20.87.94	10.20.87.95
188	10.20.87.96/27	10.20.87.97 – 10.20.87.126	10.20.87.127
189	10.20.87.128/27	10.20.87.129 – 10.20.87.158	10.20.87.159
190	10.20.87.160/27	10.20.87.161 – 10.20.87.190	10.20.87.191
191	10.20.87.192/27	10.20.87.193 – 10.20.87.222	10.20.87.223
192	10.20.87.224/27	10.20.87.225 – 10.20.87.254	10.20.87.255
193	10.20.88.0/27	10.20.88.1 – 10.20.88.30	10.20.88.31
194	10.20.88.32/27	10.20.88.33 – 10.20.88.62	10.20.88.63
195	10.20.88.64/27	10.20.88.65 – 10.20.88.94	10.20.88.95
196	10.20.88.96/27	10.20.88.97 – 10.20.88.126	10.20.88.127
197	10.20.88.128/27	10.20.88.129 – 10.20.88.158	10.20.88.159
198	10.20.88.160/27	10.20.88.161 – 10.20.88.190	10.20.88.191
199	10.20.88.192/27	10.20.88.193 – 10.20.88.222	10.20.88.223
200	10.20.88.224/27	10.20.88.225 – 10.20.88.254	10.20.88.255
201	10.20.89.0/27	10.20.89.1 – 10.20.89.30	10.20.89.31
202	10.20.89.32/27	10.20.89.33 – 10.20.89.62	10.20.89.63
203	10.20.89.64/27	10.20.89.65 – 10.20.89.94	10.20.89.95
204	10.20.89.96/27	10.20.89.97 – 10.20.89.126	10.20.89.127
205	10.20.89.128/27	10.20.89.129 – 10.20.89.158	10.20.89.159
206	10.20.89.160/27	10.20.89.161 – 10.20.89.190	10.20.89.191
207	10.20.89.192/27	10.20.89.193 – 10.20.89.222	10.20.89.223
208	10.20.89.224/27	10.20.89.225 – 10.20.89.254	10.20.89.255
209	10.20.90.0/27	10.20.90.1 – 10.20.90.30	10.20.90.31
210	10.20.90.32/27	10.20.90.33 – 10.20.90.62	10.20.90.63
211	10.20.90.64/27	10.20.90.65 – 10.20.90.94	10.20.90.95
212	10.20.90.96/27	10.20.90.97 – 10.20.90.126	10.20.90.127
213	10.20.90.128/27	10.20.90.129 – 10.20.90.158	10.20.90.159
214	10.20.90.160/27	10.20.90.161 – 10.20.90.190	10.20.90.191
215	10.20.90.192/27	10.20.90.193 – 10.20.90.222	10.20.90.223
216	10.20.90.224/27	10.20.90.225 – 10.20.90.254	10.20.90.255
217	10.20.91.0/27	10.20.91.1 – 10.20.91.30	10.20.91.31
218	10.20.91.32/27	10.20.91.33 – 10.20.91.62	10.20.91.63
219	10.20.91.64/27	10.20.91.65 – 10.20.91.94	10.20.91.95
220	10.20.91.96/27	10.20.91.97 – 10.20.91.126	10.20.91.127
221	10.20.91.128/27	10.20.91.129 – 10.20.91.158	10.20.91.159
222	10.20.91.160/27	10.20.91.161 – 10.20.91.190	10.20.91.191
223	10.20.91.192/27	10.20.91.193 – 10.20.91.222	10.20.91.223
224	10.20.91.224/27	10.20.91.225 – 10.20.91.254	10.20.91.255
225	10.20.92.0/27	10.20.92.1 – 10.20.92.30	10.20.92.31
226	10.20.92.32/27	10.20.92.33 – 10.20.92.62	10.20.92.63
227	10.20.92.64/27	10.20.92.65 – 10.20.92.94	10.20.92.95
228	10.20.92.96/27	10.20.92.97 – 10.20.92.126	10.20.92.127
229	10.20.92.128/27	10.20.92.129 – 10.20.92.158	10.20.92.159
230	10.20.92.160/27	10.20.92.161 – 10.20.92.190	10.20.92.191
231	10.20.92.192/27	10.20.92.193 – 10.20.92.222	10.20.92.223
232	10.20.92.224/27	10.20.92.225 – 10.20.92.254	10.20.92.255
233	10.20.93.0/27	10.20.93.1 – 10.20.93.30	10.20.93.31
234	10.20.93.32/27	10.20.93.33 – 10.20.93.62	10.20.93.63
235	10.20.93.64/27	10.20.93.65 – 10.20.93.94	10.20.93.95
236	10.20.93.96/27	10.20.93.97 – 10.20.93.126	10.20.93.127
237	10.20.93.128/27	10.20.93.129 – 10.20.93.158	10.20.93.159
238	10.20.93.160/27	10.20.93.161 – 10.20.93.190	10.20.93.191
239	10.20.93.192/27	10.20.93.193 – 10.20.93.222	10.20.93.223
240	10.20.93.224/27	10.20.93.225 – 10.20.93.254	10.20.93.255
241	10.20.94.0/27	10.20.94.1 – 10.20.94.30	10.20.94.31
242	10.20.94.32/27	10.20.94.33 – 10.20.94.62	10.20.94.63
243	10.20.94.64/27	10.20.94.65 – 10.20.94.94	10.20.94.95
244	10.20.94.96/27	10.20.94.97 – 10.20.94.126	10.20.94.127
245	10.20.94.128/27	10.20.94.129 – 10.20.94.158	10.20.94.159
246	10.20.94.160/27	10.20.94.161 – 10.20.94.190	10.20.94.191
247	10.20.94.192/27	10.20.94.193 – 10.20.94.222	10.20.94.223
248	10.20.94.224/27	10.20.94.225 – 10.20.94.254	10.20.94.255
249	10.20.95.0/27	10.20.95.1 – 10.20.95.30	10.20.95.31
250	10.20.95.32/27	10.20.95.33 – 10.20.95.62	10.20.95.63
251	10.20.95.64/27	10.20.95.65 – 10.20.95.94	10.20.95.95
252	10.20.95.96/27	10.20.95.97 – 10.20.95.126	10.20.95.127
253	10.20.95.128/27	10.20.95.129 – 10.20.95.158	10.20.95.159
254	10.20.95.160/27	10.20.95.161 – 10.20.95.190	10.20.95.191
255	10.20.95.192/27	10.20.95.193 – 10.20.95.222	10.20.95.223
256	10.20.95.224/27	10.20.95.225 – 10.20.95.254	10.20.95.255

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 →