`node21.mail4.pl`

DNSSEC	⚠️ Not signed
A	137.74.3.137^{🇵🇱 OVH137.74.0.0/16}
		PTR	`node21.mail4.pl`

`mail4.pl`

	DNSSEC	⚠️ Not signed
	A	149.202.110.120^{🇫🇷 OVH149.202.0.0/16}
	NS	`melissa.ns.cloudflare.com` ⭐
	NS	`noah.ns.cloudflare.com`
	MX	`mx1.mail4.pl` ⭐
	TXT	`v=spf1 include:_spf.poczta.at include:spf.antispamcloud.com -all`
	SOA	`melissa.ns.cloudflare.com`dns@cloudflare.com serial=2406317158

PTR for

137.3.74.137.in-addr.arpa

MX for

poczta.at

Same first word

node21.com

node21.net

Similar names

done21.com

12done.com

endo21.co.jp

DNS History

1 record (1 active, 0 former)

●A137.74.3.1372026-03-14 → 2026-06-08 · 2 obs

● 2026-03-14 10:00:00
● 2026-06-08 13:34:26

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
pl	j-dns.pl, f-dns.pl, a-dns.pl, d-dns.pl...	-
mail4.pl	melissa.ns.cloudflare.com, noah.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.32.199

NS records: melissa.ns.cloudflare.com, noah.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for mail4.pl (unsigned zone)

⏱️ Timing

Total: 216ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`137.74.3.137`

Analysis

Mail Server Role

node21.mail4.pl is used as a mail server for poczta.at.

As mail servers, node31.mail4.pl and node21.mail4.pl are regularly found together.

IP Addresses

node21.mail4.pl resolves to one IP address: 137.74.3.137.

mx1.mail4.pl and primary.mail4.pl are among other host names that share IP numbers with node21.mail4.pl.

node21.mail4.pl - robtex.com

node21.mail4.pl

mail4.pl