ClouDNS，保加利亚商家，正规公司（Company Identity Code:202743734，VAT Number:BG202743734），主要提供DNS服务，数据中心分布全球，有免费版和收费版，价格合适。现在黑五优惠，网站监控有5折优惠（一次性），性价比合适。
官网查看：https://www.cloudns.net/black-friday/
Our Network Monitoring services provide an opportunity to check your server or services status instantly. Our different check types cover all possible network stacks for monitoring:
ICMP Ping – 12 ICMP ping checks to the given IP address. The packets are variable in size : 4x 64 bytes, 4x 512bytes, and 4x 1024bytes.
Web checks – HTTP/HTTPS requests to the given IP address/domain. The hostname, port, and url path can be customized.
TCP – The system makes TCP connection to the given IP address on the chosen port number. If the connection is unsuccessful, the check is marked as DOWN.
UDP – UDP connection to the specific IP address and port number. If the connection is unsuccessful, the check is marked as DOWN.
DNS – DNS query for chosen domain and query type on the given IP address. If the response is not equal to the expected response, the check is marked as DOWN.
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