Web Ping

網站監測與網站連線測試，當網站臨時無法連線時，可以檢查是否是個別 ISP 或網路環境造成的網路連線問題。 (Back to Network problem)

網站連線測試

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觀察HTTP response status code(HTTP回應狀態代碼)

瀏覽網頁時，可以觀察該網頁或網頁內元件(例如嵌入圖檔或聲音)的HTTP response status code(HTTP回應狀態代碼)^[1]，例如404代表沒有該檔案。

Mozilla Firefox Firefox 內建的工具 -> 網頁開發者 -> 網頁主控台。快速鍵: Ctrl+Shift+k。
- filter: available
- example as follows:

[23:14:47.836] GET https://www.google.com/ [HTTP/1.1 200 OK 10763ms]
[23:14:59.707] GET https://www.google.com/ig/cp/get?hl=zh-TW&gl=&authuser=0&bundleJs=0 [HTTP/1.1 304 Not Modified 1593ms]

Firebug for Firefox : 切換到「網路」標籤。快速鍵: F12
Google Chrome 內建的工具 -> 開發人員工具 -> 切換到「network」標籤。快速鍵: Ctrl+Shift+i
Live HTTP Headers for Firefox
curl on Linux or macOS e.g. curl -v -o /dev/null https://www.slideshare.net ^[2]

DNS檢查

websites

What's My DNS? Global DNS Propagation Checker [Last visited: 2020-03-24] 介紹: What’s My DNS? 從世界各地的伺服器，檢查網址 DNS 更新情形
DNS Checker - DNS Check Propagation Tool 從世界各地的伺服器，檢查網址 DNS 解析 [Last visited: 2020-03-24]
Global DNS Propagation Checker - Nslookup Tool 從世界各地的伺服器，檢查網址 DNS 解析，並顯示對應 IP
IntoDNS "IntoDNS checks the health and configuration and provides DNS report and mail servers report." Quoted from official website. [Last visited: 2011-02-21] https://planetoid.info/images/Icon_exclaim.gif不能檢查 subdomain
Free DNS Report [Last visited: 2017-04-10]
SMTP MX Lookup Tool - Check your DNS MX Records online - MxToolbox [Last visited: 2017-04-10]
DNS Inspect - Free DNS checking tool with IPv6 support "checks your domain's servers for common DNS and mail errors and generates a report with explanations how to fix them."
2019 | DNS flag day [Last visited: 2019-02-02]
Domain tester [Last visited: 2019-05-06]

other web ping: fifi(ping, tracert... tools.), lookup

tools

nslookup for Win & Linux syntax: nslookup domain.com
How to Change DNS from Command Line of Mac OS X on macOS
command line - How can I direct a query to specific DNS server? - Super User on Win
Linux nslookup command help and examples on Linux

反查IP或網域

偵測使用的 CDN

偵測使用的 CDN (內容傳遞網路, Content Delivery Network或Content Distribution Network)

What's My CDN? 偵測 CDN 不能選 Global，可以選 By Region: Asia
WHOIS IP Lookup Tool | UltraTools
IP Location Finder - IP Lookup With Detailed Geolocation Data | KeyCDN Tools

references

How to find Which CDN is Used in a Website?

無法網路連線

ping local IP
ping Gateway
check DNS...
(optional) ping the IP of external website (有些機器會關閉ICMP ECHO，讓我們無法Ping到它)

distinguish which section met trouble

無法連線到網路的測試步驟

檢查網站服務 for Linux
- /etc/init.d/httpd status
- /etc/init.d/mysqld status
檢查本機端網站網頁是否能讀取
- lynx 127.0.0.1
檢查網站伺服器log
從瀏覽器直接瀏覽網站網址
- 透過命令列模擬瀏覽器瀏覽網站 e.g. curl -v -o /dev/null https://www.slideshare.net

網路連線發生不穩

如何看出哪一段線路慢了？

Windows: 開始 -> 執行 -> 輸入cmd (進入"命令提示字元")
(會顯示C:\某資料夾>)

請在閃爍游標處輸入 tracert web.domain.com (web.domain.com 改成想檢查的網站網址)

就可以看出是哪一段慢了，大家先作這個動作會有助於解決問題及增加回覆的速度喔

或者

請在閃爍游標處輸入 tracert web.domain.com > c:\result.txt

當出現第二次C:\某資料夾> (如果網路連線不穩定, 會花費相當多時間)

代表已經將連線過程紀錄成功在 c:\result.txt

請將這個文字檔寄給合適的網路管理員

參考資料

如何使用 TRACERT 疑難排解 Windows 中的 TCP/IP 問題(使用ICMP協定, 可能因為對方伺服器關閉ICMP回應, 而影響測試結果)

類似工具

GeoIP服務

Geo IP Tool (含地圖)
My IP Address Lookup / IP Locator / Trace IP / What is my ip (含地圖)
IP Address Lookup (IPv4 & IPv6)

Blog

Is My Blog Working? "Enter your blog address above to check your server status, RSS feed, markup, security, and performance." (圖例)
- 介紹: Is My Blog Working? 測試網站是否可正常運作-哈燒部落 I Want Hot News

伺服器主機資訊或採用的技術

BuiltWith Technology Lookup
- 使用方式: 線上輸入網址查詢或直接使用 bookmarklet
```
javascript:location = 'https://builtwith.com/'+location.href.replace(/https?:\/\//i, "");
```
- 介紹:
- 查詢結果: e.g. techcrunch.com Technology Profile of techcrunch.com [Last visited: 2017-05-28]
Hexometer Website Analyzer & Ranker Tool - Chrome 線上應用程式商店
- 介紹: Hexometer Website Analyzer 分析網站使用那些第三方服務或工具
- 查詢結果:
Wappalyzer - Identify technologies on websites "Wappalyzer uncovers the technologies used on websites." Quoted from website.
- 使用方式:安裝瀏覽器擴充套件或直接使用 bookmarklet。
- 介紹: 「Wappalyzer」網站照妖鏡！一鍵顯示網站所用的主機、平台、語言與框架|梅問題．教學網
- 查詢結果: 如下圖

(image hosted by flickr)

Netcraft - Search Web by Domain 可查詢伺服器主機的OS、IP及上線時間(uptime)、採用的技術等資訊。
- 使用方式: 線上輸入網址查詢或直接使用 bookmarklet
```
javascript:location%20=%20'http://toolbar.netcraft.com/site_report?url='+escape(location);%20void%200
```
- 介紹:
- 查詢結果: e.g. Site report for techcrunch.com

https://beta.shodan.io/host/IP lists general information, web technologies & open ports of specificed IP e.g. https://beta.shodan.io/host/127.0.0.1
- 使用方式: 修改上方網址 IP 處

伺服器主機上線時間(uptime)

Netcraft可查詢伺服器主機的OS、IP及上線時間(uptime)、採用的技術等資訊。 [Last visited: 2017-05-31]
Webhost Ranking - Uptime Doctor e.g. Virtual Private Hosting | Webhost Ranking - Uptime Doctor [Last visited: 2017-05-31]

伺服器啟用 HTTP 壓縮 (HTTP Compression)

檢查伺服器是否啟用 HTTP 壓縮的服務

WhatsMyIP.org | HTTP Compression Test 允許輸入 IP 網址 [Last visited: 2017-03-20]
Check GZIP compression ex: google.com is gzip compressed 不允許輸入 IP 網址，會遇到「error 15 - website address contains an invalid domain extension」錯誤訊息。 [Last visited: 2017-03-20]