Trimble Navigation Limited SPS Receiver (Shodan search) contains default admin credentials for the web interface. This family of receivers comprise the SPS Modular receiver (SPS852/SPS552H/SPSx51/SPSx50), the SPSx61 Modular GPS Heading receivers, and the SPS882 Smart GPS antenna. According to manual the defaults are admin / password. I confirmed this on firmware version 4.41.
Trimble SPS Receiver Web Interface Default Admin Credentials