DNS là Hệ thống phân giải tên miền viết tắt của Domain Name Servers. Hiện tại, ngoài DNS Google được nhiều người lựa chọn sử dụng, còn rất nhiều dịch vụ DNS khác nhau cũng ổn định và tăng tốc độ truy cập mạng.
4.2.2.2 is one of the easiest to type of a collection of 6 DNS servers at 4.2.2.1 through 4.2.2.6 (originally only 1-3). The answer queries made by the general public, which is unusual in the last several years. You see, DNS resolvers can be used to by someone on a fairly slow network line to generate a much larger amount of traffic directed at See all details about IP 4.2.2.1. | PTR record is a.resolvers.level3.net. This IP is hosted by Level 3 Parent, LLC (AS3356) and located in the country United States. User Comments About 4.2.2.1. This is a public DNS server and is safe to use. - 2013-01-07 4.2.2.4 used to have a reverse DNS to i-will-not-steal-service.gtei.net - Mikeage Nov 25 '09 at 11:59 I'd heard recently that Level 3 were planning to restrict access to 4.2.2.1 and 4.2.2.2 from the wider internet, but I don't know how accurate that is.
The Primary DNS server for Comodo Secure DNS is 8.26.56.26 & the secondary is 8.20.247.20. Try this on your system for reliability and speed. More Information about Comodo Secure DNS. 10. Free DNS. Free DNS is a great DNS solution that you can depend upon when you give importance to free availability. Their Free DNS servers are located in Austria.
What is a 4.2.2.1 DNS server? - Quora 4.2.2.1 is one of the earliest DNS servers that were hosted by BBNplanet back in the mid-90s during the birth of the Internet. It later was part of GTE internetworking when they acquired BBNplanet, was briefly part of Verizon when BellAtlantic acq 全球免费公共 DNS 解析服务器 IP 地址列表推荐 (解 … 2018-9-1 · 首选：1.2.4.8 备用：210.2.4.8 OneDNS OneDNS 是一个安全、快速、免费的小众 DNS 服务。它能屏蔽恶意网站、摆脱无良 ISP 的DNS污染与劫持。同时横跨南北的高速线路加速您的网络连接。OneDNS IPv4 地址 首选：117.50.11.11 备用：117.50.22.22
2019年DNS速度排名_nhgxxyy198990的专栏 …
2018-9-29 · 一. 在RHEL5/CentOS5/Ubuntu 10.04等linux下，dns的解析请求过程如下 1 主机从一个随机的源端口，请求 DNS的AAAA 记录，2 主机接受dns服务器返回AAAA记录，3 主机从一个另一个随机的源端口，请求 DNS的A 记录，4 主机dns 服务器返回A记录，二. BIND9免费下载 DNS服务器软件 BIND9 v9.13.2 … 2018-9-14 · DNS服务器软件 BIND9 v9.13.2 32/64位 官方版(附安装配置教程) for Win/Linux,Bind9是一款开放源码的DNS服务器软件，支持各种unix平台和windows平台，提供了一个健壮和稳定的平台组织可以在此平台上构建分布式计算系统，这里提供最新BIND9各 【RL-TCPnet网络教程】第28章 RL-TCPnet之DNS … 2018-8-31 · 第28章 RL-TCPnet之DNS应用 本章节为大家讲解RL-TCPnet的DNS应用，学习本章节前，务必要优先学习第27章的DNS基础知识。有了这些基础知识之后，再搞本章节会有事半功 Why do we ping the IP 4.2.2.2 to test connectivity 2020-6-11 · One day 4.1.1.1 stopped responding to pings, and we freaked out for a second- but only it was down. I immediately responded with, "Well, then what about 4.2.2.2?", just incrementing the 1's to 2's. It NEVER went down. It soon became our defacto test host to ping.