Hello, It seems Ultra DNS is responding with NXDOMAIN for "www.uber.com" queries. Please see the response below:
Query Link: https://dnsclient.net/#edns126.ultradns.com/www.uber.com/A/UDP > { > "Metadata": { > "NameServer": "edns126.ultradns.com:53 (204.74.66.126:53)", > "Protocol": "Udp", > "DatagramSize": "213 bytes", > "RoundTripTime": "13.92 ms" > }, > "Identifier": 21863, > "IsResponse": true, > "OPCODE": "StandardQuery", > "AuthoritativeAnswer": true, > "Truncation": false, > "RecursionDesired": true, > "RecursionAvailable": false, > "Z": 0, > "AuthenticData": false, > "CheckingDisabled": false, > "RCODE": "NxDomain", > "QDCOUNT": 1, > "ANCOUNT": 3, > "NSCOUNT": 1, > "ARCOUNT": 0, > "Question": [ > { > "Name": "www.uber.com", > "Type": "A", > "Class": "IN" > } > ], > "Answer": [ > { > "Name": "www.uber.com", > "Type": "CNAME", > "Class": "IN", > "TTL": "300 (5 mins)", > "RDLENGTH": "16 bytes", > "RDATA": { > "Domain": "frontends-all.uber.com" > } > }, > { > "Name": "frontends-all.uber.com", > "Type": "CNAME", > "Class": "IN", > "TTL": "300 (5 mins)", > "RDLENGTH": "18 bytes", > "RDATA": { > "Domain": "frontends-cloud.uber.com" > } > }, > { > "Name": "frontends-cloud.uber.com", > "Type": "CNAME", > "Class": "IN", > "TTL": "300 (5 mins)", > "RDLENGTH": "13 bytes", > "RDATA": { > "Domain": "cn-ecg.cfe.uber.com" > } > } > ], > "Authority": [ > { > "Name": "uber.com", > "Type": "SOA", > "Class": "IN", > "TTL": "900 (15 mins)", > "RDLENGTH": "58 bytes", > "RDATA": { > "PrimaryNameServer": "edns126.ultradns.com", > "ResponsiblePerson": "serviceproviders.uber.com", > "Serial": 2019057840, > "Refresh": 3600, > "Retry": 180, > "Expire": 604800, > "Minimum": 900 > } > } > ], > "Additional": [] > } > > However, querying for "cn-ecg.cfe.uber.com" to the same server responds with an answer: Query Link: https://dnsclient.net/#edns126.ultradns.com/cn-ecg.cfe.uber.com/A/UDP > { > "Metadata": { > "NameServer": "edns126.ultradns.com:53 (204.74.66.126:53)", > "Protocol": "Udp", > "DatagramSize": "186 bytes", > "RoundTripTime": "18.89 ms" > }, > "Identifier": 9834, > "IsResponse": true, > "OPCODE": "StandardQuery", > "AuthoritativeAnswer": true, > "Truncation": false, > "RecursionDesired": true, > "RecursionAvailable": false, > "Z": 0, > "AuthenticData": false, > "CheckingDisabled": false, > "RCODE": "NoError", > "QDCOUNT": 1, > "ANCOUNT": 1, > "NSCOUNT": 4, > "ARCOUNT": 0, > "Question": [ > { > "Name": "cn-ecg.cfe.uber.com", > "Type": "A", > "Class": "IN" > } > ], > "Answer": [ > { > "Name": "cn-ecg.cfe.uber.com", > "Type": "A", > "Class": "IN", > "TTL": "300 (5 mins)", > "RDLENGTH": "4 bytes", > "RDATA": { > "IPAddress": "34.98.127.226" > } > } > ], > "Authority": [ > { > "Name": "cfe.uber.com", > "Type": "NS", > "Class": "IN", > "TTL": "86400 (1 day)", > "RDLENGTH": "22 bytes", > "RDATA": { > "NameServer": "edns126.ultradns.org" > } > }, > { > "Name": "cfe.uber.com", > "Type": "NS", > "Class": "IN", > "TTL": "86400 (1 day)", > "RDLENGTH": "19 bytes", > "RDATA": { > "NameServer": "edns126.ultradns.com" > } > }, > { > "Name": "cfe.uber.com", > "Type": "NS", > "Class": "IN", > "TTL": "86400 (1 day)", > "RDLENGTH": "22 bytes", > "RDATA": { > "NameServer": "edns126.ultradns.net" > } > }, > { > "Name": "cfe.uber.com", > "Type": "NS", > "Class": "IN", > "TTL": "86400 (1 day)", > "RDLENGTH": "22 bytes", > "RDATA": { > "NameServer": "edns126.ultradns.biz" > } > } > ], > "Additional": [] > } > > Regards, *Shreyas Zare* Technitium <https://technitium.com>
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