www.using-concrete.com - robtex.com

www.using-concrete.com

DNSSEC⚠️ Not signed
A2606:4700:3033::6815:5bd9🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::ac43:b4c4🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.91.217Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.180.196🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.91.217, 172.67.180.196
IPv6 hints2606:4700:3033::6815:5bd9, 2606:4700:3035::ac43:b4c4
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=161, name=cloudflare-ech.com

using-concrete.com

DNSSEC⚠️ Not signed
A2606:4700:3033::6815:5bd9🇺🇸 Cloudflare2606:4700:3033::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:3035::ac43:b4c4🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.21.91.217Cloudflare104.21.80.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.180.196🇺🇸 Cloudflare172.67.176.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSara.ns.cloudflare.com ⭐
NSsri.ns.cloudflare.com
TXTgoogle-site-verification=LtICeX9Bpi9CiFvJlmiT3C4UgWgxz2igJFYmrA-DF_o
HTTPSHTTP/3, HTTP/2 ✓ hints match
IPv4 hints104.21.91.217, 172.67.180.196
IPv6 hints2606:4700:3033::6815:5bd9, 2606:4700:3035::ac43:b4c4
ECHX25519, HKDF-SHA256 + AES-128-GCM draft, id=161, name=cloudflare-ech.com
SOAara.ns.cloudflare.comdns@cloudflare.com serial=2410804135

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DNS History

6 records (4 active, 2 former)

A104.21.91.217172.67.180.1962606:4700:3033::6815:5bd92606:4700:3035::ac43:b4c42606:4700:3031::6815:5bd92606:4700:3033::ac43:b4c4
●A104.21.91.2172026-06-04 → 2026-08-14 · 2 obs
● 2026-06-04 22:10:16
● 2026-08-14 08:31:48
●A172.67.180.1962026-06-04 → 2026-08-14 · 2 obs
● 2026-06-04 22:10:16
● 2026-08-14 08:31:48
○A2606:4700:3031::6815:5bd92026-06-04 → 2026-06-05 · 4 obs
● 2026-06-04 22:10:16
● 2026-06-05 02:34:14
○ 2026-07-12 17:05:08
○ 2026-08-14 08:31:48
●A2606:4700:3033::6815:5bd92026-07-12 → 2026-08-14 · 3 obs
○ 2026-06-05 02:34:14
● 2026-07-12 17:05:08
● 2026-08-14 08:31:48
○A2606:4700:3033::ac43:b4c42026-06-04 → 2026-06-05 · 4 obs
● 2026-06-04 22:10:16
● 2026-06-05 02:34:14
○ 2026-07-12 17:05:08
○ 2026-08-14 08:31:48
●A2606:4700:3035::ac43:b4c42026-07-12 → 2026-08-14 · 3 obs
○ 2026-06-05 02:34:14
● 2026-07-12 17:05:08
● 2026-08-14 08:31:48

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
coml.gtld-servers.net, j.gtld-servers.net, e.gtld-servers.net, h.gtld-servers.net...-
using-concrete.comara.ns.cloudflare.com, sri.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.192.67

NS records: ara.ns.cloudflare.com, sri.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for using-concrete.com (unsigned zone)

⏱️ Timing

Total: 149ms | Queries: -

📄 Records

TypeCountSample Data
A2172.67.180.196, 104.21.91.217
AAAA22606:4700:3033::6815:5bd9, 2606:4700:3035::ac43:b4c4
HTTPS1{"priority":1,"target":".","alpn":["h3",

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (ara.ns.cloudflare.com, ara.ns.cloudflare.com, ara.ns.cloudflare.com...)

Analysis

IP Addresses

www.using-concrete.com resolves to four IP addresses: 104.21.91.217, 172.67.180.196, 2606:4700:3033::6815:5bd9 and 2606:4700:3035::ac43:b4c4.

Two other host names, along with sosw.com.cn, morgoplan.com and usdtxlm.top, also share IP numbers with www.using-concrete.com.