I do not know what the Nitrogen Service itself is, but the most common application to operate on port 7725 is Faronics Deep Freeze. It uses this port to talk to the administration console.
Port 69 and UDP are used for tftp transmissions.
Port No. for Tranmission Control Protocal (TCP) is 6 Port No. for User Datagram Protocol (UDP) is 17
UDP port 123. (UDP is a connectionless protocol that sacrifices reliability for speed and bandwidth).
There are a lot of differences between a DNS port and UDP. An example would be DNS is for translation while UDP actually relays the host communication.
DHCP is a layer-4 protocol, most commonly transported over UDP. UDP port number 67 is the destination port of a server, and UDP port number 68 is used by the client
ICMP does not have a port like TCP and UDP.
Port 1151 is used for TCP/UDP
A single port can be configured to listen for UDP or TCP inbound connection requests (or both). Telnet uses TCP. So when you telnet to a specific IP:port, telnet will attempt to make a TCP connection. If there is no TCP listener on the port you specify, then the connection request will be refused. It matters not if you have a UDP listener on the port. Telnet will not be able to establish a connection to a UDP port.
RIP uses UDP protocol with port number 520
Port 69 and UDP are used for tftp transmissions.
Udp - 520.
both tcp and udp