`api.postmarkapp.com`

DNSSEC	⚠️ Not signed
A	3.21.60.203^{🇺🇸 Amazon3.20.0.0/14 EC2 CMH prefix}
		PTR	`ec2-3-21-60-203.us-east-2.compute.amazonaws.com`
A	16.58.126.215^{🇺🇸 Amazon16.58.0.0/17 EC2 Prefix}
A	18.219.128.0^{🇺🇸 Amazon18.216.0.0/14 EC2 CMH prefix}

`postmarkapp.com`

	DNSSEC	⚠️ Not signed
	A	94.247.142.1^{🇺🇸 CLOUDFLARESPECTRUM94.247.142.0/24}
	NS	`ns-1262.awsdns-29.org` ⭐
	NS	`ns-1657.awsdns-15.co.uk`
	NS	`ns-229.awsdns-28.com`
	NS	`ns-721.awsdns-26.net`
	MX	`aspmx.l.google.com` ⭐
	MX	`alt1.aspmx.l.google.com`⁽²⁰⁾
	MX	`alt2.aspmx.l.google.com`⁽²⁰⁾
	MX	`aspmx2.googlemail.com`⁽³⁰⁾
	MX	`aspmx3.googlemail.com`⁽³⁰⁾
	TXT	`01a65dddcd764010b6df567c88b8fb7d`
	TXT	`abuseipdb-verification=QzehCZYK`
	TXT	`digicert: 00577009 nagele@wildbit.com`
	TXT	`google-site-verification=Bd-0GuslXF2wO_SnN_1pHncqvPZAuCOZxlGaly-V8zI`
	TXT	`google-site-verification=CFwYqNoJsUkztxVzMjK8u1m0_BaklRvOZb5aecNTk8o`
	TXT	`google-site-verification=aRqd5oLuMuPX2-qGutbokgWlmw76Gr68-v_Ryr0Pha8`
	TXT	`v=spf1 a mx include:spf.mtasv.net include:_spf.google.com include:cmail1.com ...`
	SOA	`ns-1262.awsdns-29.org`awsdns-hostmaster@amazon.com serial=1

WOT: SAFE (64/100)
rank #19274 globally
rank #9505 in the tld
WOT: SAFE (82/100)
📈 Tranco rank: #23,387

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DNS History

13 records (3 active, 10 former)

●A16.58.126.2152026-05-08 → 2026-05-10 · 3 obs

○ 2026-04-09 03:16:44
● 2026-05-08 17:43:42
● 2026-05-10 15:26:20

○A16.58.201.2532026-04-09 → 2026-04-09 · 4 obs

○ 2016-04-26 18:22:30
● 2026-04-09 03:16:44
○ 2026-05-08 17:43:42
○ 2026-05-10 15:26:20

○A18.119.150.1052026-04-09 → 2026-04-09 · 4 obs

○ 2016-04-26 18:22:30
● 2026-04-09 03:16:44
○ 2026-05-08 17:43:42
○ 2026-05-10 15:26:20

○A18.188.161.1692026-04-09 → 2026-04-09 · 4 obs

○ 2016-04-26 18:22:30
● 2026-04-09 03:16:44
○ 2026-05-08 17:43:42
○ 2026-05-10 15:26:20

○A18.216.7.242026-04-09 → 2026-04-09 · 4 obs

○ 2016-04-26 18:22:30
● 2026-04-09 03:16:44
○ 2026-05-08 17:43:42
○ 2026-05-10 15:26:20

●A18.219.128.02026-05-08 → 2026-05-10 · 3 obs

○ 2026-04-09 03:16:44
● 2026-05-08 17:43:42
● 2026-05-10 15:26:20

○A18.224.75.2082026-04-09 → 2026-05-10 · 2 obs

○ 2026-04-09 03:16:44
○ 2026-05-10 15:26:20

○A3.13.185.1412026-04-09 → 2026-04-09 · 4 obs

○ 2016-04-26 18:22:30
● 2026-04-09 03:16:44
○ 2026-05-08 17:43:42
○ 2026-05-10 15:26:20

○A3.134.241.1212026-04-09 → 2026-04-09 · 4 obs

○ 2016-04-26 18:22:30
● 2026-04-09 03:16:44
○ 2026-05-08 17:43:42
○ 2026-05-10 15:26:20

○A3.139.149.702026-04-09 → 2026-05-10 · 2 obs

○ 2026-04-09 03:16:44
○ 2026-05-10 15:26:20

○A3.148.94.942026-04-09 → 2026-05-10 · 2 obs

○ 2026-04-09 03:16:44
○ 2026-05-10 15:26:20

●A3.21.60.2032026-05-08 → 2026-05-10 · 3 obs

○ 2026-04-09 03:16:44
● 2026-05-08 17:43:42
● 2026-05-10 15:26:20

○A50.31.156.1092015-06-29 → 2016-04-26 · 4 obs

● 2015-06-29 14:55:32
● 2016-04-26 18:22:30
○ 2026-04-09 03:16:44
○ 2026-05-10 15:26:20

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	g.gtld-servers.net, d.gtld-servers.net, h.gtld-servers.net, i.gtld-servers.net...	-
postmarkapp.com	ns-229.awsdns-28.com, ns-721.awsdns-26.net, ns-1657.awsdns-15.co.uk, ns-1262.awsdns-29.org	2 records

✅ Authoritative Response

Server:205.251.198.121

NS records: ns-229.awsdns-28.com, ns-721.awsdns-26.net, ns-1657.awsdns-15.co.uk, ns-1262.awsdns-29.org

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for postmarkapp.com (unsigned zone)

⏱️ Timing

Total: 651ms | Queries: -

📄 Records

Type	Count	Sample Data
A	3	`18.219.128.0, 3.21.60.203...`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns-229.awsdns-28.com, ns-229.awsdns-28.com)

Analysis

IP Addresses

api.postmarkapp.com points to three IPs: 3.21.60.203, 16.58.126.215 and 18.219.128.0.

api.postmarkapp.com - robtex.com