atcoder.info - dns.ninja
atcoder.info
info
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a0.info.afilias-nst.info ⭐ | ||||||
| NS | a2.info.afilias-nst.info | ||||||
| NS | b0.info.afilias-nst.org ⚠️ Not in parent delegation | ||||||
| NS | b2.info.afilias-nst.org ⚠️ Not in parent delegation | ||||||
| NS | c0.info.afilias-nst.info | ||||||
| NS | d0.info.afilias-nst.org ⚠️ Not in parent delegation | ||||||
| SOA | a0.info.afilias-nst.infohostmaster@donuts.email serial=1781555966 | ||||||
Same first word
Similar names
DNS History
12 records (5 active, 7 former)
●NSns-102.awsdns-12.com2017-01-17 → 2026-06-15 · 3 obs
● 2017-01-17 09:51:42
● 2026-06-15 21:09:18
●NSns-1360.awsdns-42.org2017-01-17 → 2026-06-15 · 3 obs
● 2017-01-17 09:51:42
● 2026-06-15 21:09:18
●NSns-1661.awsdns-15.co.uk2017-01-17 → 2026-06-15 · 3 obs
● 2017-01-17 09:51:42
● 2026-06-15 21:09:18
●NSns-786.awsdns-34.net2017-01-17 → 2026-06-15 · 3 obs
● 2017-01-17 09:51:42
● 2026-06-15 21:09:18
○NSns1.value-domain.com2015-05-27 → 2016-04-26 · 4 obs
● 2016-04-26 11:48:44
○ 2017-01-17 09:51:42
○ 2026-06-15 21:09:18
○NSns2.value-domain.com2015-05-27 → 2016-04-26 · 4 obs
● 2016-04-26 11:48:44
○ 2017-01-17 09:51:42
○ 2026-06-15 21:09:18
●MXinbound-smtp.us-east-1.amazonaws.com2026-03-03 → 2026-06-15 · 2 obs
● 2026-06-15 21:09:18
○A119.245.243.942016-04-26 → 2016-04-26 · 4 obs
● 2016-04-26 11:48:44
○ 2017-01-17 09:51:42
○ 2026-06-15 21:09:18
○A202.222.31.772015-05-27 → 2016-02-02 · 4 obs
● 2016-02-02 13:41:20
○ 2016-04-26 11:48:44
○ 2026-06-15 21:09:18
○A52.69.152.1292017-01-17 → 2017-01-17 · 4 obs
● 2017-01-17 09:51:42
○ 2018-12-11 13:28:08
○ 2026-06-15 21:09:18
○A52.69.38.1382017-01-17 → 2017-01-17 · 4 obs
● 2017-01-17 09:51:42
○ 2018-12-11 13:28:08
○ 2026-06-15 21:09:18
○A54.92.121.722018-12-11 → 2018-12-11 · 4 obs
● 2018-12-11 13:28:08
○ 2026-03-03 12:27:32
○ 2026-06-15 21:09:18
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| info | a0.info.afilias-nst.info, a2.info.afilias-nst.info, c0.info.afilias-nst.info | - |
| atcoder.info | ns-1360.awsdns-42.org, ns-1661.awsdns-15.co.uk, ns-102.awsdns-12.com, ns-786.awsdns-34.net | - |
✅ Authoritative Response
Server:205.251.197.80
NS records: ns-1360.awsdns-42.org, ns-1661.awsdns-15.co.uk, ns-102.awsdns-12.com, ns-786.awsdns-34.net
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for atcoder.info (unsigned zone)
⏱️ Timing
Total: 559ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| NS | 4 | ns-102.awsdns-12.com, ns-1360.awsdns-42.org... |
| MX | 1 | inbound-smtp.us-east-1.amazonaws.com (pr |
| SOA | 1 | ns-786.awsdns-34.net awsdns-hostmaster.a |
Analysis
Name Servers
The authoritative name servers for atcoder.info are ns-102.awsdns-12.com, ns-786.awsdns-34.net, ns-1360.awsdns-42.org and ns-1661.awsdns-15.co.uk.
At least some of atcoder.info's name servers are shared with other domains, for example 219.136.200.in-addr.arpa, janumetxr.com, nuua.travel and two more.
Four hostnames, each resolving to a pair of IP addresses: ns-102.awsdns-12.com directs to 205.251.192.102 and 2600:9000:5300:6600::1; ns-786.awsdns-34.net directs to 205.251.195.18 and 2600:9000:5303:1200::1; ns-1360.awsdns-42.org directs to 205.251.197.80 and 2600:9000:5305:5000::1; ns-1661.awsdns-15.co.uk directs to 205.251.198.125 and 2600:9000:5306:7d00::1.
Mail Servers
Mail for atcoder.info is handled by a single mail server, inbound-smtp.us-east-1.amazonaws.com.
atcoder.info uses an identical mail server configuration to several other domains — among them fidstudio.slack.com, prelib.ca, mongoeat.slack.com and two more.
atcoder.info has at least partial mail server overlap with other domains such as goodbet.com, z-api.io, digitalpill.atlassian.net and two more.
This set of mail servers commonly appears together with the mail servers inbound-smtp.us-west-2.amazonaws.com.
inbound-smtp.us-east-1.amazonaws.com points to five IP addresses: 3.211.210.226, 44.206.9.87, 44.210.166.32 and two more.