`sg.coolmailer.workers.dev`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::6815:437^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::ac43:99e8^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.4.55^{Cloudflare104.21.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.153.232^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4	104.21.4.55, 172.67.153.232
		IPv6	2606:4700:3031::6815:437, 2606:4700:3035::ac43:99e8

`coolmailer.workers.dev`

	DNSSEC	⚠️ Not signed
	NS	`keira.ns.cloudflare.com` ⭐
	NS	`marty.ns.cloudflare.com`
	SOA	`keira.ns.cloudflare.com`dns@cloudflare.com serial=2396919869

Same first word

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sg.sv

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sg.cl

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sg.canon

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sg.gov.tr

sg.news

sg.fr

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sg.lt

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gs.lol

gs.fm.no

gs.edu

gs.construction

gs.nl

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gs.events

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gs.com.cn

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gs.s3.amazonaws.com

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gs.tm.no

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gs.edu.cn

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gs.io

gs.hl.no

gs.dm

gs.healthcare

gs.fyi

gs.credit

gs.fm

gs.net.pl

gs.bot

gs.co.uk

DNS History

4 records (4 active, 0 former)

●A104.21.4.552026-03-06 → 2026-03-29 · 2 obs

● 2026-03-06 10:13:10
● 2026-03-29 03:35:22

●A172.67.153.2322026-03-06 → 2026-03-29 · 2 obs

● 2026-03-06 10:13:10
● 2026-03-29 03:35:22

●A2606:4700:3031::6815:4372026-03-06 → 2026-03-29 · 2 obs

● 2026-03-06 10:13:10
● 2026-03-29 03:35:22

●A2606:4700:3035::ac43:99e82026-03-06 → 2026-03-29 · 2 obs

● 2026-03-06 10:13:10
● 2026-03-29 03:35:22

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
dev	ns-tld1.charlestonroadregistry.com, ns-tld2.charlestonroadregistry.com, ns-tld3.charlestonroadregistry.com, ns-tld4.charlestonroadregistry.com...	-
workers.dev	clyde.ns.cloudflare.com, sofia.ns.cloudflare.com	-
coolmailer.workers.dev	keira.ns.cloudflare.com, marty.ns.cloudflare.com	-

✅ Authoritative Response

Server:173.245.59.204

NS records: keira.ns.cloudflare.com, marty.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for workers.dev (unsigned zone)

⏱️ Timing

Total: 524ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.4.55, 172.67.153.232`
AAAA	2	`2606:4700:3035::ac43:99e8, 2606:4700:3031::6815:437`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`

Analysis

IP Addresses

sg.coolmailer.workers.dev resolves to four IPs: 2606:4700:3031::6815:437, 2606:4700:3035::ac43:99e8, 104.21.4.55 and 172.67.153.232.

Other host names, for instance venianmedia.com, 1210033-web6.sherwen.com, mail.zimcompass.com, malliance.co.il and gbwhtsplus.com share IP numbers with sg.coolmailer.workers.dev.

sg.coolmailer.workers.dev - robtex.com