postmasterclass.com - dns.ninja
postmasterclass.com
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1786303899 | ||||||
Same first word
postmasterclass.com |
Similar names
DNS History
13 records (7 active, 6 former)
○NSpdns1.ultradns.net2015-08-20 → 2018-01-14 · 4 obs
● 2018-01-14 19:39:20
○ 2026-03-17 16:20:00
○ 2026-08-09 19:43:00
○NSpdns2.ultradns.net2015-08-20 → 2018-01-14 · 4 obs
● 2018-01-14 19:39:20
○ 2026-03-17 16:20:00
○ 2026-08-09 19:43:00
○NSpdns3.ultradns.org2015-08-20 → 2018-01-14 · 4 obs
● 2018-01-14 19:39:20
○ 2026-03-17 16:20:00
○ 2026-08-09 19:43:00
○NSpdns4.ultradns.org2015-08-20 → 2018-01-14 · 4 obs
● 2018-01-14 19:39:20
○ 2026-03-17 16:20:00
○ 2026-08-09 19:43:00
○NSpdns5.ultradns.info2015-08-20 → 2018-01-14 · 4 obs
● 2018-01-14 19:39:20
○ 2026-03-17 16:20:00
○ 2026-08-09 19:43:00
○NSpdns6.ultradns.co.uk2015-08-20 → 2018-01-14 · 4 obs
● 2018-01-14 19:39:20
○ 2026-03-17 16:20:00
○ 2026-08-09 19:43:00
●NSsdns34.ultradns.biz2026-03-17 → 2026-08-09 · 3 obs
● 2026-03-17 16:20:00
● 2026-08-09 19:43:00
●NSsdns34.ultradns.com2026-03-17 → 2026-08-09 · 3 obs
● 2026-03-17 16:20:00
● 2026-08-09 19:43:00
●NSsdns34.ultradns.net2026-03-17 → 2026-08-09 · 3 obs
● 2026-03-17 16:20:00
● 2026-08-09 19:43:00
●NSsdns34.ultradns.org2026-03-17 → 2026-08-09 · 3 obs
● 2026-03-17 16:20:00
● 2026-08-09 19:43:00
●MXmxa-001a3c01.gslb.pphosted.com2015-08-20 → 2026-08-09 · 2 obs
● 2026-08-09 19:43:00
●MXmxb-001a3c01.gslb.pphosted.com2015-08-20 → 2026-08-09 · 2 obs
● 2026-08-09 19:43:00
●A174.129.15.1912015-08-20 → 2026-08-09 · 2 obs
● 2026-08-09 19:43:00
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net... | - |
| postmasterclass.com | sdns34.ultradns.com, sdns34.ultradns.net, sdns34.ultradns.biz, sdns34.ultradns.org | 2 records |
✅ Authoritative Response
Server:156.154.143.34
NS records: sdns34.ultradns.com, sdns34.ultradns.net, sdns34.ultradns.biz, sdns34.ultradns.org
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for postmasterclass.com (unsigned zone)
⏱️ Timing
Total: 498ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 174.129.15.191 |
| NS | 4 | sdns34.ultradns.biz, sdns34.ultradns.com... |
| MX | 2 | mxa-001a3c01.gslb.pphosted.com (pri: 10), mxb-001a3c01.gslb.pphosted.com (pri: 10) |
| TXT | 2 | MS=ms90902912, adA/tnG+9pTLLg4nwS3BjNdv6xFzQtAN7cRNSp/M |
| SOA | 1 | sdns34.ultradns.com commgrp.washpost.com |
📌 Glue Records Collected
Total: 2
Out-of-bailiwick: 2 (sdns34.ultradns.com, sdns34.ultradns.com)
Analysis
IP Addresses
postmasterclass.com has exactly one IP address — 174.129.15.191.
Host names such as kaplanglobalsolutions.com and ec2-174-129-15-191.compute-1.amazonaws.com share IP numbers with postmasterclass.com.
Name Servers
Four name servers handle the delegation for postmasterclass.com: sdns34.ultradns.biz, sdns34.ultradns.com, sdns34.ultradns.net and sdns34.ultradns.org.
postmasterclass.com shares at least some of its name servers with other domains, including servicealley.com, thelily.com, shopdcmagazine.com and two others.
The host names sdns34.ultradns.biz, sdns34.ultradns.com, sdns34.ultradns.net and sdns34.ultradns.org each resolve to two IP addresses: sdns34.ultradns.biz resolves to 156.154.142.34 and 2610:a1:1003::22; sdns34.ultradns.com resolves to 156.154.140.34 and 2610:a1:1001::22; sdns34.ultradns.net resolves to 156.154.141.34 and 2610:a1:1002::22; sdns34.ultradns.org resolves to 156.154.143.34 and 2610:a1:1004::22.
Mail Servers
postmasterclass.com uses two mail servers, mxa-001a3c01.gslb.pphosted.com and mxb-001a3c01.gslb.pphosted.com.
The mail server setup of postmasterclass.com matches that of other domains such as digitalink.com, wecasa.com, e.washingtonpost.com and two others.
postmasterclass.com shares at least some of its mail servers with other domains, such as newhomesguide.com and gwpi.net.
mxa-001a3c01.gslb.pphosted.com directs to 67.231.153.114, as does mxb-001a3c01.gslb.pphosted.com — both hostnames resolve to that one IP address.
mxa-001a3c01.gslb.pphosted.com along with mxb-001a3c01.gslb.pphosted.com each resolve to 67.231.153.114 IP addresses.