Monoprice PID 8743 Wireless N ADSL2 Modem and Router 802 11N WPS Function 2T2R 300Mbps - Manual (Page 77)

ADSL2/2+ Router
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Supposing that the router’s WAN IP address is 183.37.227.201, then
the Internet user only needs to enter http：//183.37.227.201 in Web
browser address field to access your Web server.
4.2.8 Security
IP Filter
IP filter function can block LAN PCs from communicating with Internet
PCs by preventing specific IP addresses from accessing external
network through router via specific a port number or range.
1) Click “Advanced Setup”
→ “Security” → “IP Filtering” to display