a-star.edu.sg

Valid Email Server
Domain Lookup › a-star.edu.sg

Domain Overview

DNS: ✓ 11h ago Checker: ✓ 11h ago
a-star.edu.sg
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-07-01 03:31:20 UTC · ↺ Refresh

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MX Hostnames

  • astar-edu-sg0c.mail.protection.outlook.com

MX Priorities

  • astar-edu-sg0c.mail.protection.outlook.com: 0

A / AAAA Records

  • 13.251.180.0 ↩ ec2-13-251-180-0.ap-southeast-1.compute.amazonaws.com
  • 54.151.226.24 ↩ ec2-54-151-226-24.ap-southeast-1.compute.amazonaws.com
  • 54.251.88.218 ↩ ec2-54-251-88-218.ap-southeast-1.compute.amazonaws.com

Mail Server IPs

  • 52.101.157.80 ↩ mail-os8pr02cu00100.inbound.protection.outlook.com
  • 52.101.137.0 ↩ mail-sg2pr03cu00500.inbound.protection.outlook.com
  • 52.101.124.117 ↩ mail-tydpr03cu00105.inbound.protection.outlook.com
  • 2a01:111:f403:cc09:: ↩ mail-sg2pr03cu00500.inbound.protection.outlook.com
  • 2a01:111:f403:cc1a::8 ↩ mail-tydpr03cu00100.inbound.protection.outlook.com
  • 2a01:111:f403:cc1f::4 ↩ mail-os8pr02cu00104.inbound.protection.outlook.com

SOA Record

Raw SOA gm-dns.a-star.edu.sg please_set_email.absolutely.nowhere 137188 10800 1080 2592000 900
Primary NS (mname)
gm-dns.a-star.edu.sg
Admin Email (rname)
please_set_email@absolutely.nowhere
Serial
137188
Refresh
10800s
Retry
1080s
Expire
2592000s
Minimum TTL
900s

Nameservers (NS)

ns2.a-star.edu.sg
ns3.a-star.edu.sg
ns1.a-star.edu.sg

SPF Record

✓ Strict (-all)
v=spf1 include:spf.a-star.edu.sg include:spf.protection.outlook.com a:a-star.edu.sg -all
📊 DNS lookups: 5/10
✓ Hard fail (-all) — strict enforcement

DMARC Record

✓ Reject
v=DMARC1; p=reject; pct=100; rua=mailto:[email protected]; ruf=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

8 records
  • anthropic-domain-verification-nhfbft=xlXdiZhFLWDDC8sy0HsO77yNp
  • 8emru3a8p6dqvmnjndmkvnuvvi
  • 47rd0ujhf7q51fdpka1t4av0fh
  • openai-domain-verification=dv-hF4hJeNX3xMbjXuxPRDJ6mim
  • successfactors-site-verification=NjkwNTJiMGFlN2ZkMTE1NmMxNDljOTQwMzI1NmNhNDA2ZTU4ZjJkNDYxNzNmNjJjNjk1NTQ0MzU4OTVkZjQwNg==
  • SPFv=spf1 include:spf.a-star.edu.sg include:spf.protection.outlook.com a:a-star.edu.sg -all
  • MS=ms39123724
  • google-site-verification=mMQ3MBwp5SMsi7xsEZzDubDB1hSekhg7f5STch55zeo
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