This Recommendation provides requirements for Internet of Things (IoT) devices used for operation of IoT applications in the context of disaster in addition to the common requirements of IoT [ITU-T Y.2066]. It also provides requirements for operation of IoT applications themselves during disaster. It is necessary to specify these requirements in order to use IoT devices and IoT applications during disaster for evacuation and rescue processes. The Appendix of this Recommendation describes methods concerning insurance of integrity and reliability of the data produced by IoT devices during disaster. This Recommendation is relevant for IoT application developers and IoT service providers as well as for emergency service providers.