indexo.dev

4letter.net

.net crawl

First seen 2026-05-12 · Last seen 2026-05-12 · ok HTTP/1.1 200 1804 ms crawled 2026-05-18

JP · 183.181.98.102 · AS131965 Xserver Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
トップページ - ４文字略語Wiki
Feeds

Technology

Server
nginx

Registration

Registrar
GMO Internet Group, Inc. d/b/a Onamae.com
Created
2020-06-12
Expires
2026-06-12 22 days left
Updated
2025-05-27
Name servers
  • ns1.xserver.jp
  • ns2.xserver.jp
  • ns3.xserver.jp
  • ns4.xserver.jp
  • ns5.xserver.jp

DNS records live

NS
  • ns1.xserver.jp
  • ns2.xserver.jp
  • ns3.xserver.jp
  • ns4.xserver.jp
  • ns5.xserver.jp
MX
  • 0 4letter.net

Email authentication weak

SPF
v=spf1 +a:sv6101.xserver.jp +a:4letter.net +mx include:spf.sender.xserver.jp ~all
softfail (~all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

R13
from 2026-05-17 to 2026-08-15
Expires in 87 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://4letter.net/

findings
  • missing HSTS
  • missing Content Security Policy
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy

Links to (1)

Linked from (1)