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)10.128.0.0/9

network10.128.0.0/9

broadcast10.255.255.255

first host10.128.0.1

last host10.255.255.254

subnet mask255.128.0.0

wildcard0.127.255.255

addresses8,388,608

usable hosts8,388,606

classA

ipcalc 10.128.0.0/9

address00001010.10000000.00000000.00000000

subnet mask11111111.10000000.00000000.00000000

network00001010.10000000.00000000.00000000

broadcast00001010.11111111.11111111.11111111

green = network part, grey = host part

hex0x0a800000

decimal176160768

reverse dns0.0.128.10.in-addr.arpa

ipv4-mapped::ffff:a80:0

/9 split into /25 · 65,536 subnets

close ×

#	network	host range	broadcast
1	10.128.0.0/25	10.128.0.1 – 10.128.0.126	10.128.0.127
2	10.128.0.128/25	10.128.0.129 – 10.128.0.254	10.128.0.255
3	10.128.1.0/25	10.128.1.1 – 10.128.1.126	10.128.1.127
4	10.128.1.128/25	10.128.1.129 – 10.128.1.254	10.128.1.255
5	10.128.2.0/25	10.128.2.1 – 10.128.2.126	10.128.2.127
6	10.128.2.128/25	10.128.2.129 – 10.128.2.254	10.128.2.255
7	10.128.3.0/25	10.128.3.1 – 10.128.3.126	10.128.3.127
8	10.128.3.128/25	10.128.3.129 – 10.128.3.254	10.128.3.255
9	10.128.4.0/25	10.128.4.1 – 10.128.4.126	10.128.4.127
10	10.128.4.128/25	10.128.4.129 – 10.128.4.254	10.128.4.255
11	10.128.5.0/25	10.128.5.1 – 10.128.5.126	10.128.5.127
12	10.128.5.128/25	10.128.5.129 – 10.128.5.254	10.128.5.255
13	10.128.6.0/25	10.128.6.1 – 10.128.6.126	10.128.6.127
14	10.128.6.128/25	10.128.6.129 – 10.128.6.254	10.128.6.255
15	10.128.7.0/25	10.128.7.1 – 10.128.7.126	10.128.7.127
16	10.128.7.128/25	10.128.7.129 – 10.128.7.254	10.128.7.255
17	10.128.8.0/25	10.128.8.1 – 10.128.8.126	10.128.8.127
18	10.128.8.128/25	10.128.8.129 – 10.128.8.254	10.128.8.255
19	10.128.9.0/25	10.128.9.1 – 10.128.9.126	10.128.9.127
20	10.128.9.128/25	10.128.9.129 – 10.128.9.254	10.128.9.255
21	10.128.10.0/25	10.128.10.1 – 10.128.10.126	10.128.10.127
22	10.128.10.128/25	10.128.10.129 – 10.128.10.254	10.128.10.255
23	10.128.11.0/25	10.128.11.1 – 10.128.11.126	10.128.11.127
24	10.128.11.128/25	10.128.11.129 – 10.128.11.254	10.128.11.255
25	10.128.12.0/25	10.128.12.1 – 10.128.12.126	10.128.12.127
26	10.128.12.128/25	10.128.12.129 – 10.128.12.254	10.128.12.255
27	10.128.13.0/25	10.128.13.1 – 10.128.13.126	10.128.13.127
28	10.128.13.128/25	10.128.13.129 – 10.128.13.254	10.128.13.255
29	10.128.14.0/25	10.128.14.1 – 10.128.14.126	10.128.14.127
30	10.128.14.128/25	10.128.14.129 – 10.128.14.254	10.128.14.255
31	10.128.15.0/25	10.128.15.1 – 10.128.15.126	10.128.15.127
32	10.128.15.128/25	10.128.15.129 – 10.128.15.254	10.128.15.255
33	10.128.16.0/25	10.128.16.1 – 10.128.16.126	10.128.16.127
34	10.128.16.128/25	10.128.16.129 – 10.128.16.254	10.128.16.255
35	10.128.17.0/25	10.128.17.1 – 10.128.17.126	10.128.17.127
36	10.128.17.128/25	10.128.17.129 – 10.128.17.254	10.128.17.255
37	10.128.18.0/25	10.128.18.1 – 10.128.18.126	10.128.18.127
38	10.128.18.128/25	10.128.18.129 – 10.128.18.254	10.128.18.255
39	10.128.19.0/25	10.128.19.1 – 10.128.19.126	10.128.19.127
40	10.128.19.128/25	10.128.19.129 – 10.128.19.254	10.128.19.255
41	10.128.20.0/25	10.128.20.1 – 10.128.20.126	10.128.20.127
42	10.128.20.128/25	10.128.20.129 – 10.128.20.254	10.128.20.255
43	10.128.21.0/25	10.128.21.1 – 10.128.21.126	10.128.21.127
44	10.128.21.128/25	10.128.21.129 – 10.128.21.254	10.128.21.255
45	10.128.22.0/25	10.128.22.1 – 10.128.22.126	10.128.22.127
46	10.128.22.128/25	10.128.22.129 – 10.128.22.254	10.128.22.255
47	10.128.23.0/25	10.128.23.1 – 10.128.23.126	10.128.23.127
48	10.128.23.128/25	10.128.23.129 – 10.128.23.254	10.128.23.255
49	10.128.24.0/25	10.128.24.1 – 10.128.24.126	10.128.24.127
50	10.128.24.128/25	10.128.24.129 – 10.128.24.254	10.128.24.255
51	10.128.25.0/25	10.128.25.1 – 10.128.25.126	10.128.25.127
52	10.128.25.128/25	10.128.25.129 – 10.128.25.254	10.128.25.255
53	10.128.26.0/25	10.128.26.1 – 10.128.26.126	10.128.26.127
54	10.128.26.128/25	10.128.26.129 – 10.128.26.254	10.128.26.255
55	10.128.27.0/25	10.128.27.1 – 10.128.27.126	10.128.27.127
56	10.128.27.128/25	10.128.27.129 – 10.128.27.254	10.128.27.255
57	10.128.28.0/25	10.128.28.1 – 10.128.28.126	10.128.28.127
58	10.128.28.128/25	10.128.28.129 – 10.128.28.254	10.128.28.255
59	10.128.29.0/25	10.128.29.1 – 10.128.29.126	10.128.29.127
60	10.128.29.128/25	10.128.29.129 – 10.128.29.254	10.128.29.255
61	10.128.30.0/25	10.128.30.1 – 10.128.30.126	10.128.30.127
62	10.128.30.128/25	10.128.30.129 – 10.128.30.254	10.128.30.255
63	10.128.31.0/25	10.128.31.1 – 10.128.31.126	10.128.31.127
64	10.128.31.128/25	10.128.31.129 – 10.128.31.254	10.128.31.255
65	10.128.32.0/25	10.128.32.1 – 10.128.32.126	10.128.32.127
66	10.128.32.128/25	10.128.32.129 – 10.128.32.254	10.128.32.255
67	10.128.33.0/25	10.128.33.1 – 10.128.33.126	10.128.33.127
68	10.128.33.128/25	10.128.33.129 – 10.128.33.254	10.128.33.255
69	10.128.34.0/25	10.128.34.1 – 10.128.34.126	10.128.34.127
70	10.128.34.128/25	10.128.34.129 – 10.128.34.254	10.128.34.255
71	10.128.35.0/25	10.128.35.1 – 10.128.35.126	10.128.35.127
72	10.128.35.128/25	10.128.35.129 – 10.128.35.254	10.128.35.255
73	10.128.36.0/25	10.128.36.1 – 10.128.36.126	10.128.36.127
74	10.128.36.128/25	10.128.36.129 – 10.128.36.254	10.128.36.255
75	10.128.37.0/25	10.128.37.1 – 10.128.37.126	10.128.37.127
76	10.128.37.128/25	10.128.37.129 – 10.128.37.254	10.128.37.255
77	10.128.38.0/25	10.128.38.1 – 10.128.38.126	10.128.38.127
78	10.128.38.128/25	10.128.38.129 – 10.128.38.254	10.128.38.255
79	10.128.39.0/25	10.128.39.1 – 10.128.39.126	10.128.39.127
80	10.128.39.128/25	10.128.39.129 – 10.128.39.254	10.128.39.255
81	10.128.40.0/25	10.128.40.1 – 10.128.40.126	10.128.40.127
82	10.128.40.128/25	10.128.40.129 – 10.128.40.254	10.128.40.255
83	10.128.41.0/25	10.128.41.1 – 10.128.41.126	10.128.41.127
84	10.128.41.128/25	10.128.41.129 – 10.128.41.254	10.128.41.255
85	10.128.42.0/25	10.128.42.1 – 10.128.42.126	10.128.42.127
86	10.128.42.128/25	10.128.42.129 – 10.128.42.254	10.128.42.255
87	10.128.43.0/25	10.128.43.1 – 10.128.43.126	10.128.43.127
88	10.128.43.128/25	10.128.43.129 – 10.128.43.254	10.128.43.255
89	10.128.44.0/25	10.128.44.1 – 10.128.44.126	10.128.44.127
90	10.128.44.128/25	10.128.44.129 – 10.128.44.254	10.128.44.255
91	10.128.45.0/25	10.128.45.1 – 10.128.45.126	10.128.45.127
92	10.128.45.128/25	10.128.45.129 – 10.128.45.254	10.128.45.255
93	10.128.46.0/25	10.128.46.1 – 10.128.46.126	10.128.46.127
94	10.128.46.128/25	10.128.46.129 – 10.128.46.254	10.128.46.255
95	10.128.47.0/25	10.128.47.1 – 10.128.47.126	10.128.47.127
96	10.128.47.128/25	10.128.47.129 – 10.128.47.254	10.128.47.255
97	10.128.48.0/25	10.128.48.1 – 10.128.48.126	10.128.48.127
98	10.128.48.128/25	10.128.48.129 – 10.128.48.254	10.128.48.255
99	10.128.49.0/25	10.128.49.1 – 10.128.49.126	10.128.49.127
100	10.128.49.128/25	10.128.49.129 – 10.128.49.254	10.128.49.255
101	10.128.50.0/25	10.128.50.1 – 10.128.50.126	10.128.50.127
102	10.128.50.128/25	10.128.50.129 – 10.128.50.254	10.128.50.255
103	10.128.51.0/25	10.128.51.1 – 10.128.51.126	10.128.51.127
104	10.128.51.128/25	10.128.51.129 – 10.128.51.254	10.128.51.255
105	10.128.52.0/25	10.128.52.1 – 10.128.52.126	10.128.52.127
106	10.128.52.128/25	10.128.52.129 – 10.128.52.254	10.128.52.255
107	10.128.53.0/25	10.128.53.1 – 10.128.53.126	10.128.53.127
108	10.128.53.128/25	10.128.53.129 – 10.128.53.254	10.128.53.255
109	10.128.54.0/25	10.128.54.1 – 10.128.54.126	10.128.54.127
110	10.128.54.128/25	10.128.54.129 – 10.128.54.254	10.128.54.255
111	10.128.55.0/25	10.128.55.1 – 10.128.55.126	10.128.55.127
112	10.128.55.128/25	10.128.55.129 – 10.128.55.254	10.128.55.255
113	10.128.56.0/25	10.128.56.1 – 10.128.56.126	10.128.56.127
114	10.128.56.128/25	10.128.56.129 – 10.128.56.254	10.128.56.255
115	10.128.57.0/25	10.128.57.1 – 10.128.57.126	10.128.57.127
116	10.128.57.128/25	10.128.57.129 – 10.128.57.254	10.128.57.255
117	10.128.58.0/25	10.128.58.1 – 10.128.58.126	10.128.58.127
118	10.128.58.128/25	10.128.58.129 – 10.128.58.254	10.128.58.255
119	10.128.59.0/25	10.128.59.1 – 10.128.59.126	10.128.59.127
120	10.128.59.128/25	10.128.59.129 – 10.128.59.254	10.128.59.255
121	10.128.60.0/25	10.128.60.1 – 10.128.60.126	10.128.60.127
122	10.128.60.128/25	10.128.60.129 – 10.128.60.254	10.128.60.255
123	10.128.61.0/25	10.128.61.1 – 10.128.61.126	10.128.61.127
124	10.128.61.128/25	10.128.61.129 – 10.128.61.254	10.128.61.255
125	10.128.62.0/25	10.128.62.1 – 10.128.62.126	10.128.62.127
126	10.128.62.128/25	10.128.62.129 – 10.128.62.254	10.128.62.255
127	10.128.63.0/25	10.128.63.1 – 10.128.63.126	10.128.63.127
128	10.128.63.128/25	10.128.63.129 – 10.128.63.254	10.128.63.255
129	10.128.64.0/25	10.128.64.1 – 10.128.64.126	10.128.64.127
130	10.128.64.128/25	10.128.64.129 – 10.128.64.254	10.128.64.255
131	10.128.65.0/25	10.128.65.1 – 10.128.65.126	10.128.65.127
132	10.128.65.128/25	10.128.65.129 – 10.128.65.254	10.128.65.255
133	10.128.66.0/25	10.128.66.1 – 10.128.66.126	10.128.66.127
134	10.128.66.128/25	10.128.66.129 – 10.128.66.254	10.128.66.255
135	10.128.67.0/25	10.128.67.1 – 10.128.67.126	10.128.67.127
136	10.128.67.128/25	10.128.67.129 – 10.128.67.254	10.128.67.255
137	10.128.68.0/25	10.128.68.1 – 10.128.68.126	10.128.68.127
138	10.128.68.128/25	10.128.68.129 – 10.128.68.254	10.128.68.255
139	10.128.69.0/25	10.128.69.1 – 10.128.69.126	10.128.69.127
140	10.128.69.128/25	10.128.69.129 – 10.128.69.254	10.128.69.255
141	10.128.70.0/25	10.128.70.1 – 10.128.70.126	10.128.70.127
142	10.128.70.128/25	10.128.70.129 – 10.128.70.254	10.128.70.255
143	10.128.71.0/25	10.128.71.1 – 10.128.71.126	10.128.71.127
144	10.128.71.128/25	10.128.71.129 – 10.128.71.254	10.128.71.255
145	10.128.72.0/25	10.128.72.1 – 10.128.72.126	10.128.72.127
146	10.128.72.128/25	10.128.72.129 – 10.128.72.254	10.128.72.255
147	10.128.73.0/25	10.128.73.1 – 10.128.73.126	10.128.73.127
148	10.128.73.128/25	10.128.73.129 – 10.128.73.254	10.128.73.255
149	10.128.74.0/25	10.128.74.1 – 10.128.74.126	10.128.74.127
150	10.128.74.128/25	10.128.74.129 – 10.128.74.254	10.128.74.255
151	10.128.75.0/25	10.128.75.1 – 10.128.75.126	10.128.75.127
152	10.128.75.128/25	10.128.75.129 – 10.128.75.254	10.128.75.255
153	10.128.76.0/25	10.128.76.1 – 10.128.76.126	10.128.76.127
154	10.128.76.128/25	10.128.76.129 – 10.128.76.254	10.128.76.255
155	10.128.77.0/25	10.128.77.1 – 10.128.77.126	10.128.77.127
156	10.128.77.128/25	10.128.77.129 – 10.128.77.254	10.128.77.255
157	10.128.78.0/25	10.128.78.1 – 10.128.78.126	10.128.78.127
158	10.128.78.128/25	10.128.78.129 – 10.128.78.254	10.128.78.255
159	10.128.79.0/25	10.128.79.1 – 10.128.79.126	10.128.79.127
160	10.128.79.128/25	10.128.79.129 – 10.128.79.254	10.128.79.255
161	10.128.80.0/25	10.128.80.1 – 10.128.80.126	10.128.80.127
162	10.128.80.128/25	10.128.80.129 – 10.128.80.254	10.128.80.255
163	10.128.81.0/25	10.128.81.1 – 10.128.81.126	10.128.81.127
164	10.128.81.128/25	10.128.81.129 – 10.128.81.254	10.128.81.255
165	10.128.82.0/25	10.128.82.1 – 10.128.82.126	10.128.82.127
166	10.128.82.128/25	10.128.82.129 – 10.128.82.254	10.128.82.255
167	10.128.83.0/25	10.128.83.1 – 10.128.83.126	10.128.83.127
168	10.128.83.128/25	10.128.83.129 – 10.128.83.254	10.128.83.255
169	10.128.84.0/25	10.128.84.1 – 10.128.84.126	10.128.84.127
170	10.128.84.128/25	10.128.84.129 – 10.128.84.254	10.128.84.255
171	10.128.85.0/25	10.128.85.1 – 10.128.85.126	10.128.85.127
172	10.128.85.128/25	10.128.85.129 – 10.128.85.254	10.128.85.255
173	10.128.86.0/25	10.128.86.1 – 10.128.86.126	10.128.86.127
174	10.128.86.128/25	10.128.86.129 – 10.128.86.254	10.128.86.255
175	10.128.87.0/25	10.128.87.1 – 10.128.87.126	10.128.87.127
176	10.128.87.128/25	10.128.87.129 – 10.128.87.254	10.128.87.255
177	10.128.88.0/25	10.128.88.1 – 10.128.88.126	10.128.88.127
178	10.128.88.128/25	10.128.88.129 – 10.128.88.254	10.128.88.255
179	10.128.89.0/25	10.128.89.1 – 10.128.89.126	10.128.89.127
180	10.128.89.128/25	10.128.89.129 – 10.128.89.254	10.128.89.255
181	10.128.90.0/25	10.128.90.1 – 10.128.90.126	10.128.90.127
182	10.128.90.128/25	10.128.90.129 – 10.128.90.254	10.128.90.255
183	10.128.91.0/25	10.128.91.1 – 10.128.91.126	10.128.91.127
184	10.128.91.128/25	10.128.91.129 – 10.128.91.254	10.128.91.255
185	10.128.92.0/25	10.128.92.1 – 10.128.92.126	10.128.92.127
186	10.128.92.128/25	10.128.92.129 – 10.128.92.254	10.128.92.255
187	10.128.93.0/25	10.128.93.1 – 10.128.93.126	10.128.93.127
188	10.128.93.128/25	10.128.93.129 – 10.128.93.254	10.128.93.255
189	10.128.94.0/25	10.128.94.1 – 10.128.94.126	10.128.94.127
190	10.128.94.128/25	10.128.94.129 – 10.128.94.254	10.128.94.255
191	10.128.95.0/25	10.128.95.1 – 10.128.95.126	10.128.95.127
192	10.128.95.128/25	10.128.95.129 – 10.128.95.254	10.128.95.255
193	10.128.96.0/25	10.128.96.1 – 10.128.96.126	10.128.96.127
194	10.128.96.128/25	10.128.96.129 – 10.128.96.254	10.128.96.255
195	10.128.97.0/25	10.128.97.1 – 10.128.97.126	10.128.97.127
196	10.128.97.128/25	10.128.97.129 – 10.128.97.254	10.128.97.255
197	10.128.98.0/25	10.128.98.1 – 10.128.98.126	10.128.98.127
198	10.128.98.128/25	10.128.98.129 – 10.128.98.254	10.128.98.255
199	10.128.99.0/25	10.128.99.1 – 10.128.99.126	10.128.99.127
200	10.128.99.128/25	10.128.99.129 – 10.128.99.254	10.128.99.255
201	10.128.100.0/25	10.128.100.1 – 10.128.100.126	10.128.100.127
202	10.128.100.128/25	10.128.100.129 – 10.128.100.254	10.128.100.255
203	10.128.101.0/25	10.128.101.1 – 10.128.101.126	10.128.101.127
204	10.128.101.128/25	10.128.101.129 – 10.128.101.254	10.128.101.255
205	10.128.102.0/25	10.128.102.1 – 10.128.102.126	10.128.102.127
206	10.128.102.128/25	10.128.102.129 – 10.128.102.254	10.128.102.255
207	10.128.103.0/25	10.128.103.1 – 10.128.103.126	10.128.103.127
208	10.128.103.128/25	10.128.103.129 – 10.128.103.254	10.128.103.255
209	10.128.104.0/25	10.128.104.1 – 10.128.104.126	10.128.104.127
210	10.128.104.128/25	10.128.104.129 – 10.128.104.254	10.128.104.255
211	10.128.105.0/25	10.128.105.1 – 10.128.105.126	10.128.105.127
212	10.128.105.128/25	10.128.105.129 – 10.128.105.254	10.128.105.255
213	10.128.106.0/25	10.128.106.1 – 10.128.106.126	10.128.106.127
214	10.128.106.128/25	10.128.106.129 – 10.128.106.254	10.128.106.255
215	10.128.107.0/25	10.128.107.1 – 10.128.107.126	10.128.107.127
216	10.128.107.128/25	10.128.107.129 – 10.128.107.254	10.128.107.255
217	10.128.108.0/25	10.128.108.1 – 10.128.108.126	10.128.108.127
218	10.128.108.128/25	10.128.108.129 – 10.128.108.254	10.128.108.255
219	10.128.109.0/25	10.128.109.1 – 10.128.109.126	10.128.109.127
220	10.128.109.128/25	10.128.109.129 – 10.128.109.254	10.128.109.255
221	10.128.110.0/25	10.128.110.1 – 10.128.110.126	10.128.110.127
222	10.128.110.128/25	10.128.110.129 – 10.128.110.254	10.128.110.255
223	10.128.111.0/25	10.128.111.1 – 10.128.111.126	10.128.111.127
224	10.128.111.128/25	10.128.111.129 – 10.128.111.254	10.128.111.255
225	10.128.112.0/25	10.128.112.1 – 10.128.112.126	10.128.112.127
226	10.128.112.128/25	10.128.112.129 – 10.128.112.254	10.128.112.255
227	10.128.113.0/25	10.128.113.1 – 10.128.113.126	10.128.113.127
228	10.128.113.128/25	10.128.113.129 – 10.128.113.254	10.128.113.255
229	10.128.114.0/25	10.128.114.1 – 10.128.114.126	10.128.114.127
230	10.128.114.128/25	10.128.114.129 – 10.128.114.254	10.128.114.255
231	10.128.115.0/25	10.128.115.1 – 10.128.115.126	10.128.115.127
232	10.128.115.128/25	10.128.115.129 – 10.128.115.254	10.128.115.255
233	10.128.116.0/25	10.128.116.1 – 10.128.116.126	10.128.116.127
234	10.128.116.128/25	10.128.116.129 – 10.128.116.254	10.128.116.255
235	10.128.117.0/25	10.128.117.1 – 10.128.117.126	10.128.117.127
236	10.128.117.128/25	10.128.117.129 – 10.128.117.254	10.128.117.255
237	10.128.118.0/25	10.128.118.1 – 10.128.118.126	10.128.118.127
238	10.128.118.128/25	10.128.118.129 – 10.128.118.254	10.128.118.255
239	10.128.119.0/25	10.128.119.1 – 10.128.119.126	10.128.119.127
240	10.128.119.128/25	10.128.119.129 – 10.128.119.254	10.128.119.255
241	10.128.120.0/25	10.128.120.1 – 10.128.120.126	10.128.120.127
242	10.128.120.128/25	10.128.120.129 – 10.128.120.254	10.128.120.255
243	10.128.121.0/25	10.128.121.1 – 10.128.121.126	10.128.121.127
244	10.128.121.128/25	10.128.121.129 – 10.128.121.254	10.128.121.255
245	10.128.122.0/25	10.128.122.1 – 10.128.122.126	10.128.122.127
246	10.128.122.128/25	10.128.122.129 – 10.128.122.254	10.128.122.255
247	10.128.123.0/25	10.128.123.1 – 10.128.123.126	10.128.123.127
248	10.128.123.128/25	10.128.123.129 – 10.128.123.254	10.128.123.255
249	10.128.124.0/25	10.128.124.1 – 10.128.124.126	10.128.124.127
250	10.128.124.128/25	10.128.124.129 – 10.128.124.254	10.128.124.255
251	10.128.125.0/25	10.128.125.1 – 10.128.125.126	10.128.125.127
252	10.128.125.128/25	10.128.125.129 – 10.128.125.254	10.128.125.255
253	10.128.126.0/25	10.128.126.1 – 10.128.126.126	10.128.126.127
254	10.128.126.128/25	10.128.126.129 – 10.128.126.254	10.128.126.255
255	10.128.127.0/25	10.128.127.1 – 10.128.127.126	10.128.127.127
256	10.128.127.128/25	10.128.127.129 – 10.128.127.254	10.128.127.255

showing 256 of 65,536

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 /9
/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	1
/10	255.192.0.0	4,194,304	4,194,302	2 split →
/11	255.224.0.0	2,097,152	2,097,150	4 split →
/12	255.240.0.0	1,048,576	1,048,574	8 split →
/13	255.248.0.0	524,288	524,286	16 split →
/14	255.252.0.0	262,144	262,142	32 split →
/15	255.254.0.0	131,072	131,070	64 split →
/16	255.255.0.0	65,536	65,534	128 split →
/17	255.255.128.0	32,768	32,766	256 split →
/18	255.255.192.0	16,384	16,382	512 split →
/19	255.255.224.0	8,192	8,190	1,024 split →
/20	255.255.240.0	4,096	4,094	2,048 split →
/21	255.255.248.0	2,048	2,046	4,096 split →
/22	255.255.252.0	1,024	1,022	8,192 split →
/23	255.255.254.0	512	510	16,384 split →
/24	255.255.255.0	256	254	32,768 split →
/25	255.255.255.128	128	126	65,536 split →
/26	255.255.255.192	64	62	131,072 split →
/27	255.255.255.224	32	30	262,144 split →
/28	255.255.255.240	16	14	524,288 split →
/29	255.255.255.248	8	6	1,048,576 split →
/30	255.255.255.252	4	2	2,097,152 split →
/31	255.255.255.254	2	2	4,194,304 split →
/32	255.255.255.255	1	1	8,388,608 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 →