hackerrank.co - dns.ninja
hackerrank.co
co
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | ns0.centralnic.net ⭐ | ||||||
| NS | a.registrydns.co | ||||||
| NS | b.registrydns.co | ||||||
| NS | c.registrydns.co | ||||||
| NS | d.registrydns.co | ||||||
| SOA | ns0.centralnic.nethostmaster@centralnic.net serial=1759687415 | ||||||
Same first word
Similar names
DNS History
9 records (7 active, 2 former)
●NSdns1.registrar-servers.com2017-06-03 → 2026-06-21 · 2 obs
● 2026-06-21 13:51:58
●NSdns2.registrar-servers.com2017-06-03 → 2026-06-21 · 2 obs
● 2026-06-21 13:51:58
●MXeforward1.registrar-servers.com2017-06-03 → 2026-06-21 · 2 obs
● 2026-06-21 13:51:58
●MXeforward2.registrar-servers.com2017-06-03 → 2026-06-21 · 2 obs
● 2026-06-21 13:51:58
●MXeforward3.registrar-servers.com2017-06-03 → 2026-06-21 · 2 obs
● 2026-06-21 13:51:58
●MXeforward4.registrar-servers.com2017-06-03 → 2026-06-21 · 2 obs
● 2026-06-21 13:51:58
●MXeforward5.registrar-servers.com2017-06-03 → 2026-06-21 · 2 obs
● 2026-06-21 13:51:58
○A192.64.119.1682017-06-03 → 2017-06-03 · 3 obs
○ 2026-03-29 10:15:00
○ 2026-06-21 13:51:58
○A192.64.119.1932026-03-29 → 2026-04-29 · 4 obs
● 2026-03-29 10:15:00
● 2026-04-29 20:56:08
○ 2026-06-21 13:51:58
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| co | a.registrydns.co, b.registrydns.co, c.registrydns.co, d.registrydns.co | - |
| hackerrank.co | dns1.registrar-servers.com, dns2.registrar-servers.com | - |
✅ Authoritative Response
Server:156.154.133.200
NS records: dns1.registrar-servers.com, dns2.registrar-servers.com
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for hackerrank.co (unsigned zone)
⏱️ Timing
Total: 294ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 2 | dns1.registrar-servers.com, dns2.registrar-servers.com |
| MX | 5 | eforward1.registrar-servers.com (pri: 10, eforward2.registrar-servers.com (pri: 10... |
| TXT | 1 | v=spf1 include:spf.efwd.registrar-server |
| SOA | 1 | dns1.registrar-servers.com hostmaster.re |
Analysis
Name Servers
DNS delegation for hackerrank.co points to two name servers: dns1.registrar-servers.com and dns2.registrar-servers.com.
hackerrank.co has the same name server delegation as a number of other domains, such as vietnamcdn.com, mkbuwi9z7.com, quity.net and two more.
hackerrank.co has overlapping name servers with several other domains — among them somthin.com, apcbatterycenter.info, sliptune.com and dermpathdiagnostics.biz.
The name servers dns3.registrar-servers.com, dns4.registrar-servers.com and dns5.registrar-servers.com are commonly seen alongside these name servers.
dns1.registrar-servers.com directs to 156.154.132.200 and 2610:a1:1024::200. dns2.registrar-servers.com directs to 156.154.133.200 and 2610:a1:1025::200. Each host name carries two IP addresses.
Mail Servers
hackerrank.co has five mail servers, which are eforward1.registrar-servers.com, eforward2.registrar-servers.com, eforward3.registrar-servers.com and two others.
hackerrank.co shares at least some of its mail servers with other domains — for example alexavegas88.com, csscatalog.com, leanuxmas.com and two more.
It is common for these mail servers to co-occur with eforward4.registrar-servers.com, eforward5.registrar-servers.com, eforward6.registrar-servers.com and eforward7.registrar-servers.com as mail servers.
Hosts that resolve to one IP address:
eforward1.registrar-servers.com directs to 162.255.118.51.
eforward2.registrar-servers.com directs to 162.255.118.52.
eforward3.registrar-servers.com directs to 162.255.118.51.
eforward4.registrar-servers.com directs to 162.255.118.52.
eforward5.registrar-servers.com directs to 162.255.118.51.
eforward1.registrar-servers.com, eforward3.registrar-servers.com and eforward5.registrar-servers.com all direct to 162.255.118.51.
Host names pointing to 162.255.118.52 IP addresses: eforward2.registrar-servers.com and eforward4.registrar-servers.com.