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)10.42.0.0/16

network10.42.0.0/16

broadcast10.42.255.255

first host10.42.0.1

last host10.42.255.254

subnet mask255.255.0.0

wildcard0.0.255.255

addresses65,536

usable hosts65,534

classA

ipcalc 10.42.0.0/16

address00001010.00101010.00000000.00000000

subnet mask11111111.11111111.00000000.00000000

network00001010.00101010.00000000.00000000

broadcast00001010.00101010.11111111.11111111

green = network part, grey = host part

hex0x0a2a0000

decimal170524672

reverse dns0.0.42.10.in-addr.arpa

ipv4-mapped::ffff:a2a:0

/16 split into /24 · 256 subnets

close ×

#	network	host range	broadcast
1	10.42.0.0/24	10.42.0.1 – 10.42.0.254	10.42.0.255
2	10.42.1.0/24	10.42.1.1 – 10.42.1.254	10.42.1.255
3	10.42.2.0/24	10.42.2.1 – 10.42.2.254	10.42.2.255
4	10.42.3.0/24	10.42.3.1 – 10.42.3.254	10.42.3.255
5	10.42.4.0/24	10.42.4.1 – 10.42.4.254	10.42.4.255
6	10.42.5.0/24	10.42.5.1 – 10.42.5.254	10.42.5.255
7	10.42.6.0/24	10.42.6.1 – 10.42.6.254	10.42.6.255
8	10.42.7.0/24	10.42.7.1 – 10.42.7.254	10.42.7.255
9	10.42.8.0/24	10.42.8.1 – 10.42.8.254	10.42.8.255
10	10.42.9.0/24	10.42.9.1 – 10.42.9.254	10.42.9.255
11	10.42.10.0/24	10.42.10.1 – 10.42.10.254	10.42.10.255
12	10.42.11.0/24	10.42.11.1 – 10.42.11.254	10.42.11.255
13	10.42.12.0/24	10.42.12.1 – 10.42.12.254	10.42.12.255
14	10.42.13.0/24	10.42.13.1 – 10.42.13.254	10.42.13.255
15	10.42.14.0/24	10.42.14.1 – 10.42.14.254	10.42.14.255
16	10.42.15.0/24	10.42.15.1 – 10.42.15.254	10.42.15.255
17	10.42.16.0/24	10.42.16.1 – 10.42.16.254	10.42.16.255
18	10.42.17.0/24	10.42.17.1 – 10.42.17.254	10.42.17.255
19	10.42.18.0/24	10.42.18.1 – 10.42.18.254	10.42.18.255
20	10.42.19.0/24	10.42.19.1 – 10.42.19.254	10.42.19.255
21	10.42.20.0/24	10.42.20.1 – 10.42.20.254	10.42.20.255
22	10.42.21.0/24	10.42.21.1 – 10.42.21.254	10.42.21.255
23	10.42.22.0/24	10.42.22.1 – 10.42.22.254	10.42.22.255
24	10.42.23.0/24	10.42.23.1 – 10.42.23.254	10.42.23.255
25	10.42.24.0/24	10.42.24.1 – 10.42.24.254	10.42.24.255
26	10.42.25.0/24	10.42.25.1 – 10.42.25.254	10.42.25.255
27	10.42.26.0/24	10.42.26.1 – 10.42.26.254	10.42.26.255
28	10.42.27.0/24	10.42.27.1 – 10.42.27.254	10.42.27.255
29	10.42.28.0/24	10.42.28.1 – 10.42.28.254	10.42.28.255
30	10.42.29.0/24	10.42.29.1 – 10.42.29.254	10.42.29.255
31	10.42.30.0/24	10.42.30.1 – 10.42.30.254	10.42.30.255
32	10.42.31.0/24	10.42.31.1 – 10.42.31.254	10.42.31.255
33	10.42.32.0/24	10.42.32.1 – 10.42.32.254	10.42.32.255
34	10.42.33.0/24	10.42.33.1 – 10.42.33.254	10.42.33.255
35	10.42.34.0/24	10.42.34.1 – 10.42.34.254	10.42.34.255
36	10.42.35.0/24	10.42.35.1 – 10.42.35.254	10.42.35.255
37	10.42.36.0/24	10.42.36.1 – 10.42.36.254	10.42.36.255
38	10.42.37.0/24	10.42.37.1 – 10.42.37.254	10.42.37.255
39	10.42.38.0/24	10.42.38.1 – 10.42.38.254	10.42.38.255
40	10.42.39.0/24	10.42.39.1 – 10.42.39.254	10.42.39.255
41	10.42.40.0/24	10.42.40.1 – 10.42.40.254	10.42.40.255
42	10.42.41.0/24	10.42.41.1 – 10.42.41.254	10.42.41.255
43	10.42.42.0/24	10.42.42.1 – 10.42.42.254	10.42.42.255
44	10.42.43.0/24	10.42.43.1 – 10.42.43.254	10.42.43.255
45	10.42.44.0/24	10.42.44.1 – 10.42.44.254	10.42.44.255
46	10.42.45.0/24	10.42.45.1 – 10.42.45.254	10.42.45.255
47	10.42.46.0/24	10.42.46.1 – 10.42.46.254	10.42.46.255
48	10.42.47.0/24	10.42.47.1 – 10.42.47.254	10.42.47.255
49	10.42.48.0/24	10.42.48.1 – 10.42.48.254	10.42.48.255
50	10.42.49.0/24	10.42.49.1 – 10.42.49.254	10.42.49.255
51	10.42.50.0/24	10.42.50.1 – 10.42.50.254	10.42.50.255
52	10.42.51.0/24	10.42.51.1 – 10.42.51.254	10.42.51.255
53	10.42.52.0/24	10.42.52.1 – 10.42.52.254	10.42.52.255
54	10.42.53.0/24	10.42.53.1 – 10.42.53.254	10.42.53.255
55	10.42.54.0/24	10.42.54.1 – 10.42.54.254	10.42.54.255
56	10.42.55.0/24	10.42.55.1 – 10.42.55.254	10.42.55.255
57	10.42.56.0/24	10.42.56.1 – 10.42.56.254	10.42.56.255
58	10.42.57.0/24	10.42.57.1 – 10.42.57.254	10.42.57.255
59	10.42.58.0/24	10.42.58.1 – 10.42.58.254	10.42.58.255
60	10.42.59.0/24	10.42.59.1 – 10.42.59.254	10.42.59.255
61	10.42.60.0/24	10.42.60.1 – 10.42.60.254	10.42.60.255
62	10.42.61.0/24	10.42.61.1 – 10.42.61.254	10.42.61.255
63	10.42.62.0/24	10.42.62.1 – 10.42.62.254	10.42.62.255
64	10.42.63.0/24	10.42.63.1 – 10.42.63.254	10.42.63.255
65	10.42.64.0/24	10.42.64.1 – 10.42.64.254	10.42.64.255
66	10.42.65.0/24	10.42.65.1 – 10.42.65.254	10.42.65.255
67	10.42.66.0/24	10.42.66.1 – 10.42.66.254	10.42.66.255
68	10.42.67.0/24	10.42.67.1 – 10.42.67.254	10.42.67.255
69	10.42.68.0/24	10.42.68.1 – 10.42.68.254	10.42.68.255
70	10.42.69.0/24	10.42.69.1 – 10.42.69.254	10.42.69.255
71	10.42.70.0/24	10.42.70.1 – 10.42.70.254	10.42.70.255
72	10.42.71.0/24	10.42.71.1 – 10.42.71.254	10.42.71.255
73	10.42.72.0/24	10.42.72.1 – 10.42.72.254	10.42.72.255
74	10.42.73.0/24	10.42.73.1 – 10.42.73.254	10.42.73.255
75	10.42.74.0/24	10.42.74.1 – 10.42.74.254	10.42.74.255
76	10.42.75.0/24	10.42.75.1 – 10.42.75.254	10.42.75.255
77	10.42.76.0/24	10.42.76.1 – 10.42.76.254	10.42.76.255
78	10.42.77.0/24	10.42.77.1 – 10.42.77.254	10.42.77.255
79	10.42.78.0/24	10.42.78.1 – 10.42.78.254	10.42.78.255
80	10.42.79.0/24	10.42.79.1 – 10.42.79.254	10.42.79.255
81	10.42.80.0/24	10.42.80.1 – 10.42.80.254	10.42.80.255
82	10.42.81.0/24	10.42.81.1 – 10.42.81.254	10.42.81.255
83	10.42.82.0/24	10.42.82.1 – 10.42.82.254	10.42.82.255
84	10.42.83.0/24	10.42.83.1 – 10.42.83.254	10.42.83.255
85	10.42.84.0/24	10.42.84.1 – 10.42.84.254	10.42.84.255
86	10.42.85.0/24	10.42.85.1 – 10.42.85.254	10.42.85.255
87	10.42.86.0/24	10.42.86.1 – 10.42.86.254	10.42.86.255
88	10.42.87.0/24	10.42.87.1 – 10.42.87.254	10.42.87.255
89	10.42.88.0/24	10.42.88.1 – 10.42.88.254	10.42.88.255
90	10.42.89.0/24	10.42.89.1 – 10.42.89.254	10.42.89.255
91	10.42.90.0/24	10.42.90.1 – 10.42.90.254	10.42.90.255
92	10.42.91.0/24	10.42.91.1 – 10.42.91.254	10.42.91.255
93	10.42.92.0/24	10.42.92.1 – 10.42.92.254	10.42.92.255
94	10.42.93.0/24	10.42.93.1 – 10.42.93.254	10.42.93.255
95	10.42.94.0/24	10.42.94.1 – 10.42.94.254	10.42.94.255
96	10.42.95.0/24	10.42.95.1 – 10.42.95.254	10.42.95.255
97	10.42.96.0/24	10.42.96.1 – 10.42.96.254	10.42.96.255
98	10.42.97.0/24	10.42.97.1 – 10.42.97.254	10.42.97.255
99	10.42.98.0/24	10.42.98.1 – 10.42.98.254	10.42.98.255
100	10.42.99.0/24	10.42.99.1 – 10.42.99.254	10.42.99.255
101	10.42.100.0/24	10.42.100.1 – 10.42.100.254	10.42.100.255
102	10.42.101.0/24	10.42.101.1 – 10.42.101.254	10.42.101.255
103	10.42.102.0/24	10.42.102.1 – 10.42.102.254	10.42.102.255
104	10.42.103.0/24	10.42.103.1 – 10.42.103.254	10.42.103.255
105	10.42.104.0/24	10.42.104.1 – 10.42.104.254	10.42.104.255
106	10.42.105.0/24	10.42.105.1 – 10.42.105.254	10.42.105.255
107	10.42.106.0/24	10.42.106.1 – 10.42.106.254	10.42.106.255
108	10.42.107.0/24	10.42.107.1 – 10.42.107.254	10.42.107.255
109	10.42.108.0/24	10.42.108.1 – 10.42.108.254	10.42.108.255
110	10.42.109.0/24	10.42.109.1 – 10.42.109.254	10.42.109.255
111	10.42.110.0/24	10.42.110.1 – 10.42.110.254	10.42.110.255
112	10.42.111.0/24	10.42.111.1 – 10.42.111.254	10.42.111.255
113	10.42.112.0/24	10.42.112.1 – 10.42.112.254	10.42.112.255
114	10.42.113.0/24	10.42.113.1 – 10.42.113.254	10.42.113.255
115	10.42.114.0/24	10.42.114.1 – 10.42.114.254	10.42.114.255
116	10.42.115.0/24	10.42.115.1 – 10.42.115.254	10.42.115.255
117	10.42.116.0/24	10.42.116.1 – 10.42.116.254	10.42.116.255
118	10.42.117.0/24	10.42.117.1 – 10.42.117.254	10.42.117.255
119	10.42.118.0/24	10.42.118.1 – 10.42.118.254	10.42.118.255
120	10.42.119.0/24	10.42.119.1 – 10.42.119.254	10.42.119.255
121	10.42.120.0/24	10.42.120.1 – 10.42.120.254	10.42.120.255
122	10.42.121.0/24	10.42.121.1 – 10.42.121.254	10.42.121.255
123	10.42.122.0/24	10.42.122.1 – 10.42.122.254	10.42.122.255
124	10.42.123.0/24	10.42.123.1 – 10.42.123.254	10.42.123.255
125	10.42.124.0/24	10.42.124.1 – 10.42.124.254	10.42.124.255
126	10.42.125.0/24	10.42.125.1 – 10.42.125.254	10.42.125.255
127	10.42.126.0/24	10.42.126.1 – 10.42.126.254	10.42.126.255
128	10.42.127.0/24	10.42.127.1 – 10.42.127.254	10.42.127.255
129	10.42.128.0/24	10.42.128.1 – 10.42.128.254	10.42.128.255
130	10.42.129.0/24	10.42.129.1 – 10.42.129.254	10.42.129.255
131	10.42.130.0/24	10.42.130.1 – 10.42.130.254	10.42.130.255
132	10.42.131.0/24	10.42.131.1 – 10.42.131.254	10.42.131.255
133	10.42.132.0/24	10.42.132.1 – 10.42.132.254	10.42.132.255
134	10.42.133.0/24	10.42.133.1 – 10.42.133.254	10.42.133.255
135	10.42.134.0/24	10.42.134.1 – 10.42.134.254	10.42.134.255
136	10.42.135.0/24	10.42.135.1 – 10.42.135.254	10.42.135.255
137	10.42.136.0/24	10.42.136.1 – 10.42.136.254	10.42.136.255
138	10.42.137.0/24	10.42.137.1 – 10.42.137.254	10.42.137.255
139	10.42.138.0/24	10.42.138.1 – 10.42.138.254	10.42.138.255
140	10.42.139.0/24	10.42.139.1 – 10.42.139.254	10.42.139.255
141	10.42.140.0/24	10.42.140.1 – 10.42.140.254	10.42.140.255
142	10.42.141.0/24	10.42.141.1 – 10.42.141.254	10.42.141.255
143	10.42.142.0/24	10.42.142.1 – 10.42.142.254	10.42.142.255
144	10.42.143.0/24	10.42.143.1 – 10.42.143.254	10.42.143.255
145	10.42.144.0/24	10.42.144.1 – 10.42.144.254	10.42.144.255
146	10.42.145.0/24	10.42.145.1 – 10.42.145.254	10.42.145.255
147	10.42.146.0/24	10.42.146.1 – 10.42.146.254	10.42.146.255
148	10.42.147.0/24	10.42.147.1 – 10.42.147.254	10.42.147.255
149	10.42.148.0/24	10.42.148.1 – 10.42.148.254	10.42.148.255
150	10.42.149.0/24	10.42.149.1 – 10.42.149.254	10.42.149.255
151	10.42.150.0/24	10.42.150.1 – 10.42.150.254	10.42.150.255
152	10.42.151.0/24	10.42.151.1 – 10.42.151.254	10.42.151.255
153	10.42.152.0/24	10.42.152.1 – 10.42.152.254	10.42.152.255
154	10.42.153.0/24	10.42.153.1 – 10.42.153.254	10.42.153.255
155	10.42.154.0/24	10.42.154.1 – 10.42.154.254	10.42.154.255
156	10.42.155.0/24	10.42.155.1 – 10.42.155.254	10.42.155.255
157	10.42.156.0/24	10.42.156.1 – 10.42.156.254	10.42.156.255
158	10.42.157.0/24	10.42.157.1 – 10.42.157.254	10.42.157.255
159	10.42.158.0/24	10.42.158.1 – 10.42.158.254	10.42.158.255
160	10.42.159.0/24	10.42.159.1 – 10.42.159.254	10.42.159.255
161	10.42.160.0/24	10.42.160.1 – 10.42.160.254	10.42.160.255
162	10.42.161.0/24	10.42.161.1 – 10.42.161.254	10.42.161.255
163	10.42.162.0/24	10.42.162.1 – 10.42.162.254	10.42.162.255
164	10.42.163.0/24	10.42.163.1 – 10.42.163.254	10.42.163.255
165	10.42.164.0/24	10.42.164.1 – 10.42.164.254	10.42.164.255
166	10.42.165.0/24	10.42.165.1 – 10.42.165.254	10.42.165.255
167	10.42.166.0/24	10.42.166.1 – 10.42.166.254	10.42.166.255
168	10.42.167.0/24	10.42.167.1 – 10.42.167.254	10.42.167.255
169	10.42.168.0/24	10.42.168.1 – 10.42.168.254	10.42.168.255
170	10.42.169.0/24	10.42.169.1 – 10.42.169.254	10.42.169.255
171	10.42.170.0/24	10.42.170.1 – 10.42.170.254	10.42.170.255
172	10.42.171.0/24	10.42.171.1 – 10.42.171.254	10.42.171.255
173	10.42.172.0/24	10.42.172.1 – 10.42.172.254	10.42.172.255
174	10.42.173.0/24	10.42.173.1 – 10.42.173.254	10.42.173.255
175	10.42.174.0/24	10.42.174.1 – 10.42.174.254	10.42.174.255
176	10.42.175.0/24	10.42.175.1 – 10.42.175.254	10.42.175.255
177	10.42.176.0/24	10.42.176.1 – 10.42.176.254	10.42.176.255
178	10.42.177.0/24	10.42.177.1 – 10.42.177.254	10.42.177.255
179	10.42.178.0/24	10.42.178.1 – 10.42.178.254	10.42.178.255
180	10.42.179.0/24	10.42.179.1 – 10.42.179.254	10.42.179.255
181	10.42.180.0/24	10.42.180.1 – 10.42.180.254	10.42.180.255
182	10.42.181.0/24	10.42.181.1 – 10.42.181.254	10.42.181.255
183	10.42.182.0/24	10.42.182.1 – 10.42.182.254	10.42.182.255
184	10.42.183.0/24	10.42.183.1 – 10.42.183.254	10.42.183.255
185	10.42.184.0/24	10.42.184.1 – 10.42.184.254	10.42.184.255
186	10.42.185.0/24	10.42.185.1 – 10.42.185.254	10.42.185.255
187	10.42.186.0/24	10.42.186.1 – 10.42.186.254	10.42.186.255
188	10.42.187.0/24	10.42.187.1 – 10.42.187.254	10.42.187.255
189	10.42.188.0/24	10.42.188.1 – 10.42.188.254	10.42.188.255
190	10.42.189.0/24	10.42.189.1 – 10.42.189.254	10.42.189.255
191	10.42.190.0/24	10.42.190.1 – 10.42.190.254	10.42.190.255
192	10.42.191.0/24	10.42.191.1 – 10.42.191.254	10.42.191.255
193	10.42.192.0/24	10.42.192.1 – 10.42.192.254	10.42.192.255
194	10.42.193.0/24	10.42.193.1 – 10.42.193.254	10.42.193.255
195	10.42.194.0/24	10.42.194.1 – 10.42.194.254	10.42.194.255
196	10.42.195.0/24	10.42.195.1 – 10.42.195.254	10.42.195.255
197	10.42.196.0/24	10.42.196.1 – 10.42.196.254	10.42.196.255
198	10.42.197.0/24	10.42.197.1 – 10.42.197.254	10.42.197.255
199	10.42.198.0/24	10.42.198.1 – 10.42.198.254	10.42.198.255
200	10.42.199.0/24	10.42.199.1 – 10.42.199.254	10.42.199.255
201	10.42.200.0/24	10.42.200.1 – 10.42.200.254	10.42.200.255
202	10.42.201.0/24	10.42.201.1 – 10.42.201.254	10.42.201.255
203	10.42.202.0/24	10.42.202.1 – 10.42.202.254	10.42.202.255
204	10.42.203.0/24	10.42.203.1 – 10.42.203.254	10.42.203.255
205	10.42.204.0/24	10.42.204.1 – 10.42.204.254	10.42.204.255
206	10.42.205.0/24	10.42.205.1 – 10.42.205.254	10.42.205.255
207	10.42.206.0/24	10.42.206.1 – 10.42.206.254	10.42.206.255
208	10.42.207.0/24	10.42.207.1 – 10.42.207.254	10.42.207.255
209	10.42.208.0/24	10.42.208.1 – 10.42.208.254	10.42.208.255
210	10.42.209.0/24	10.42.209.1 – 10.42.209.254	10.42.209.255
211	10.42.210.0/24	10.42.210.1 – 10.42.210.254	10.42.210.255
212	10.42.211.0/24	10.42.211.1 – 10.42.211.254	10.42.211.255
213	10.42.212.0/24	10.42.212.1 – 10.42.212.254	10.42.212.255
214	10.42.213.0/24	10.42.213.1 – 10.42.213.254	10.42.213.255
215	10.42.214.0/24	10.42.214.1 – 10.42.214.254	10.42.214.255
216	10.42.215.0/24	10.42.215.1 – 10.42.215.254	10.42.215.255
217	10.42.216.0/24	10.42.216.1 – 10.42.216.254	10.42.216.255
218	10.42.217.0/24	10.42.217.1 – 10.42.217.254	10.42.217.255
219	10.42.218.0/24	10.42.218.1 – 10.42.218.254	10.42.218.255
220	10.42.219.0/24	10.42.219.1 – 10.42.219.254	10.42.219.255
221	10.42.220.0/24	10.42.220.1 – 10.42.220.254	10.42.220.255
222	10.42.221.0/24	10.42.221.1 – 10.42.221.254	10.42.221.255
223	10.42.222.0/24	10.42.222.1 – 10.42.222.254	10.42.222.255
224	10.42.223.0/24	10.42.223.1 – 10.42.223.254	10.42.223.255
225	10.42.224.0/24	10.42.224.1 – 10.42.224.254	10.42.224.255
226	10.42.225.0/24	10.42.225.1 – 10.42.225.254	10.42.225.255
227	10.42.226.0/24	10.42.226.1 – 10.42.226.254	10.42.226.255
228	10.42.227.0/24	10.42.227.1 – 10.42.227.254	10.42.227.255
229	10.42.228.0/24	10.42.228.1 – 10.42.228.254	10.42.228.255
230	10.42.229.0/24	10.42.229.1 – 10.42.229.254	10.42.229.255
231	10.42.230.0/24	10.42.230.1 – 10.42.230.254	10.42.230.255
232	10.42.231.0/24	10.42.231.1 – 10.42.231.254	10.42.231.255
233	10.42.232.0/24	10.42.232.1 – 10.42.232.254	10.42.232.255
234	10.42.233.0/24	10.42.233.1 – 10.42.233.254	10.42.233.255
235	10.42.234.0/24	10.42.234.1 – 10.42.234.254	10.42.234.255
236	10.42.235.0/24	10.42.235.1 – 10.42.235.254	10.42.235.255
237	10.42.236.0/24	10.42.236.1 – 10.42.236.254	10.42.236.255
238	10.42.237.0/24	10.42.237.1 – 10.42.237.254	10.42.237.255
239	10.42.238.0/24	10.42.238.1 – 10.42.238.254	10.42.238.255
240	10.42.239.0/24	10.42.239.1 – 10.42.239.254	10.42.239.255
241	10.42.240.0/24	10.42.240.1 – 10.42.240.254	10.42.240.255
242	10.42.241.0/24	10.42.241.1 – 10.42.241.254	10.42.241.255
243	10.42.242.0/24	10.42.242.1 – 10.42.242.254	10.42.242.255
244	10.42.243.0/24	10.42.243.1 – 10.42.243.254	10.42.243.255
245	10.42.244.0/24	10.42.244.1 – 10.42.244.254	10.42.244.255
246	10.42.245.0/24	10.42.245.1 – 10.42.245.254	10.42.245.255
247	10.42.246.0/24	10.42.246.1 – 10.42.246.254	10.42.246.255
248	10.42.247.0/24	10.42.247.1 – 10.42.247.254	10.42.247.255
249	10.42.248.0/24	10.42.248.1 – 10.42.248.254	10.42.248.255
250	10.42.249.0/24	10.42.249.1 – 10.42.249.254	10.42.249.255
251	10.42.250.0/24	10.42.250.1 – 10.42.250.254	10.42.250.255
252	10.42.251.0/24	10.42.251.1 – 10.42.251.254	10.42.251.255
253	10.42.252.0/24	10.42.252.1 – 10.42.252.254	10.42.252.255
254	10.42.253.0/24	10.42.253.1 – 10.42.253.254	10.42.253.255
255	10.42.254.0/24	10.42.254.1 – 10.42.254.254	10.42.254.255
256	10.42.255.0/24	10.42.255.1 – 10.42.255.254	10.42.255.255

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 /16
/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	1
/17	255.255.128.0	32,768	32,766	2 split →
/18	255.255.192.0	16,384	16,382	4 split →
/19	255.255.224.0	8,192	8,190	8 split →
/20	255.255.240.0	4,096	4,094	16 split →
/21	255.255.248.0	2,048	2,046	32 split →
/22	255.255.252.0	1,024	1,022	64 split →
/23	255.255.254.0	512	510	128 split →
/24	255.255.255.0	256	254	256 split →
/25	255.255.255.128	128	126	512 split →
/26	255.255.255.192	64	62	1,024 split →
/27	255.255.255.224	32	30	2,048 split →
/28	255.255.255.240	16	14	4,096 split →
/29	255.255.255.248	8	6	8,192 split →
/30	255.255.255.252	4	2	16,384 split →
/31	255.255.255.254	2	2	32,768 split →
/32	255.255.255.255	1	1	65,536 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 →