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/etc/services

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The services file contains information regarding the known services available in the Internet. For each service a single line should be present with the following information:

official service name port number / protocol name aliases

For example, say you want to know what port and protocol mdns might use:

dave@abulafia % cat /etc/services | grep dns
dnsix            90/tcp    #DNSIX Securit Attribute Token Map
dnsix            90/udp    #DNSIX Securit Attribute Token Map
sdnskmp         558/tcp
sdnskmp         558/udp
mdns            5353/tcp   #Multicast DNS
mdns            5353/udp   #Multicast DNS
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