I previously tested ISIF's Korea optimization; this time there is another similar product from the same upstream, so I tested it too. xhj014

Quick Test Links

Live Probe YABS Node Quality Mixed Benchmark nws.sh Streaming Unlock
[Link] [Link] [Link] [Link] [Link] [Link]

100tb.io, a very new provider whose upstream is Sakura Link. Other well-known providers using the same upstream include YxVM, ISIF, FxTransit, and Neburst. The provider seems to focus on the international market, without active community marketing or private traffic operations. This is a relatively new approach, and the product may mainly rely on affiliate channels for marketing.

The tested product is the SC 1GB model from the Korea Premium line, with optimized routes for all three mainland networks. Notably, upstream Sakura Link has a rare Korea CN2 GIA route (not even CTG GIA). This product and ISIF's KR-COM are currently the only two large-bandwidth premium Korea route machines that retail users can buy. Recently the upstream Telecom CN2 finally completed whitelist approval, significantly reducing Telecom latency, and the results are impressive. However, like ISIF's Korea optimized machine, it is more expensive than large-bandwidth Japan optimized machines. I recommend it to Telecom/Mobile users who strictly need a Korea route or native Korean IP, perhaps for online games.

(1) Network quality

Speed: consistency between evening peak and daytime off-peak is very good. Single-thread return-to-China speeds on all three networks cannot saturate 1G, but are generally 600-800Mbps, which is good for Korea. Only Guangdong Mobile is relatively low during the evening peak.

Latency: thanks to whitelisted CN2, Telecom latency is notably low, especially in the Yangtze River Delta; itdog measured Shanghai Telecom as low as 22 ms. Although Mobile uses CMIN2 both ways, its latency is much higher than Telecom. Telecom and Mobile both use their own optimized routes and have good latency during both peak and off-peak periods. Unicom has the highest latency, and some provinces/cities show large evening-peak jitter.

Routes: return routes are Telecom CN2, Unicom CMIN2, and Mobile CMIN2. Shanghai Unicom and Guangzhou Unicom are cross-network, while Beijing Unicom uses 10099->4837 return. Outbound routes are Telecom CN2, Unicom 10099, and Mobile CMIN2.

International: Korea's international connectivity has never been very good. Some websites detour through Japan; accessing OneDrive, Facebook, Instagram, Google, and YouTube requires pulling data from Japan, adding more than 30 ms of latency. If you need those services, latency is worse than Japan optimized routes. Local speed is good. Bandwidth to Japan is insufficient, with single-thread speed below 200Mbps both ways. Bandwidth to Hong Kong is selectively optimized; it seems only home broadband and some IDCs connected to CTCSCI can reach high speeds both ways.

(2) IP quality

Native Korean IP. Google geolocation is still in Hong Kong, so Gemini is not unlocked. Script tests show full local streaming unlock, currently very good.

(3) Machine performance

CPU performance is poor; at this price it has only one core and a Geekbench 5 score in the 600s. I/O is average. All specs in this product line have only one CPU core, with relatively little memory and disk as well. This is likely due to the product positioning: cross-border acceleration rather than high-performance/high-load use.

Disclosure: "100TB KR-Premium-SC 1GB (AMD)" was provided by the provider; this article has no affiliate links.

Product Configuration
Plan 🇰🇷 100TB KR-Premium-SC 1GB (AMD)
Location Korea, Seoul
CPU 1 x AMD EPYC 7B13 vCore
RAM 1GB
Disk 20GB
Traffic 2TB(two-way billing)
Peak Bandwidth 1Gbps
Return Route TelecomCN2/Unicom CMIN2/Mobile CMIN2
Outbound Route TelecomCN2/Unicom10099/Mobile CMIN2
Network 1 x IPv4
Price Monthly USD42.00/Annual USD420.00
Plan List
Plan CPU Memory Disk Bandwidth Traffic Monthly Price Annual Price
KR-Premium-SC 512MB (AMD) 1 core 0.5G 10G 500M 1TB USD 21 USD 210
KR-Premium-SC 1GB (AMD) 1 core 1G 20G 1G 2TB USD 42 USD 420
KR-Premium-SC 2GB (AMD) 1 core 2G 50G 1G 5TB USD 99 USD 990

Vernal equinox discount campaign (no affiliate):https://100tb.io/campaigns/2026-spring-equinox-day

1. Network Quality

Single-Thread Return-to-China Speed Tests (including some popular models)
Evening Peak Speed Test Off-Peak Speed Test
NetQuality 
bash ‹(curl -sL https://Check. Place) -N
Evening Peak Off-Peak
Two-Way Routes

Return Routes

bash ‹(curl -sL https://Check. Place) -N

Outbound Routes

Test Site: itdog.cn
Test Time: 2026-03-06 21:30
ShanghaiTelecom ShanghaiUnicom Shanghai Mobile
Three-Network Latency

Evening Peak TCP Latency

Test Site: itdog.cn
Test Time: 2026-03-06 21:30
China Telecom China Unicom China Mobile

Off-Peak TCP Latency

Test Site: itdog.cn
Test Time: 2026-03-06 09:30
China Telecom China Unicom China Mobile
International Speed Tests

bgp.tools

Test Site: bgp.tools
Test Time: 2026-03-06 21:00

International Latency

Test Site: iplark.com
Test Time: 2026-03-06 21:30

Web Latency

bash <(wget -qO- https://raw.githubusercontent.com/danger-dream/network-latency-tester/main/latency.sh)

Own-node Speed Tests

Test Method: iPerf3 TCP single-thread & ICMP Ping, one 10-second run
Test Time: 2026-03-06 21:00
iPerf3 ICMP Ping

Cloudflare Local Speed Test

wget -qO- https://github.com/code-inflation/cfspeedtest/releases/latest/download/cfspeedtest-x86_64-unknown-linux-gnu.tar.gz | tar xz && ./cfspeedtest --nr-latency-tests 25; rm ./cfspeedtest

Avg GET request latency 35.64 ms (RTT excluding server processing time)
Summary Statistics
Type     Payload |  min/max/avg in mbit/s
Download  100KB  |  min 10.15   max 25.48   avg 21.67  
Download  1MB    |  min 68.03   max 241.08  avg 210.18 
Download  10MB   |  min 578.54  max 748.50  avg 715.45 
Download  25MB   |  min 695.41  max 906.82  avg 848.66 
Upload    100KB  |  min 22.89   max 85.89   avg 62.00  
Upload    1MB    |  min 356.66  max 502.70  avg 433.70 
Upload    10MB   |  min 500.27  max 939.77  avg 666.39 
Upload    25MB   |  min 456.24  max 770.34  avg 626.46

Apple Local Speed Test

curl -sL nxtrace.org/speedtest | bash

  ▸ Idle Latency
  [+] Endpoint: https://mensura.cdn-apple.com/api/v1/gm/small
  [+] Samples: 20
      ➜  15.58 ms median  (min 13.98 / avg 21.11 / max 54.16)  jitter 2.11 ms

  ▸ Download (single thread)
  [+] Threads: 1
  [+] Limit: 2G / 10s per thread
      ➜  812 Mbps  (987.2 MiB in 10.2s)
  [+] Loaded latency: 83.02 ms  (jitter 4.32 ms)

  ▸ Download (multi-thread)
  [+] Threads: 4
  [+] Limit: 2G / 10s per thread
      ➜  719 Mbps  (908.4 MiB in 10.6s, 4 threads)
  [+] Loaded latency: 111.68 ms  (jitter 4.86 ms)

  ▸ Upload (single thread)
  [+] Threads: 1
  [+] Limit: 2G / 10s per thread
      ➜  405 Mbps  (488.0 MiB in 10.1s)
  [+] Loaded latency: 75.27 ms  (jitter 0.85 ms)

  ▸ Upload (multi-thread)
  [+] Threads: 4
  [+] Limit: 2G / 10s per thread
      ➜  479 Mbps  (582.1 MiB in 10.2s, 4 threads)
  [+] Loaded latency: 82.07 ms  (jitter 2.30 ms)

Speedtest Multi-Thread Test

curl -sL nws.sh | bash

---------------------------------- nws.sh ---------------------------------
      A simple script to bench network performance using speedtest-cli     
---------------------------------------------------------------------------
 Version            : v2025.11.07
 Global Speedtest   : wget -qO- nws.sh | bash
 Region Speedtest   : wget -qO- nws.sh | bash -s -- -r <region>
 Ping & Routing     : wget -qO- nws.sh | bash -s -- -rt <region>
---------------------------------------------------------------------------
 Speedtest.net (Region: GLOBAL)
---------------------------------------------------------------------------
 Location         Latency     Loss    DL Speed       UP Speed       Server      

 ISP: Korea Data 

 Nearest          1.54 ms     0.0%    29.53 Mbps     973.29 Mbps    GSL Networks - Seoul 

 Bangalore, IN    148.19 ms   0.0%    8.35 Mbps      706.43 Mbps    Bharti Airtel Ltd - Bangalore 
 Chennai, IN      128.49 ms   0.0%    9.70 Mbps      774.69 Mbps    RailTel Corporation of India Ltd - Chennai 
 Mumbai, IN       210.29 ms   0.0%    643.66 Mbps    681.61 Mbps    Melbicom - Mumbai 

 Seattle, US      139.77 ms   N/A     8.00 Mbps      162.91 Mbps    Comcast - Seattle, WA 
 Los Angeles, US  131.85 ms   0.0%    7.67 Mbps      140.43 Mbps    ReliableSite Hosting - Los Angeles, CA 
 Dallas, US       195.91 ms   0.0%    802.55 Mbps    151.77 Mbps    Hivelocity - Dallas, TX 
 Miami, US        195.02 ms           180.92 Mbps    FAILED         Frontier - Miami, FL 
 New York, US     193.54 ms   0.0%    172.19 Mbps    871.28 Mbps    GSL Networks - New York, NY 
 Toronto, CA      218.53 ms   0.0%    900.51 Mbps    123.13 Mbps    Rogers - Toronto, ON 
 Mexico City, MX  171.88 ms   0.0%    5.87 Mbps      99.92 Mbps     INFINITUM - Ciudad de México 

 London, UK       248.24 ms   0.0%    178.38 Mbps    146.44 Mbps    VeloxServ Communications - London 
 Amsterdam, NL    FAILED                                                        
 Paris, FR        231.14 ms   0.0%    596.48 Mbps    157.57 Mbps    Scaleway - Paris 
 Frankfurt, DE    219.12 ms   0.0%    752.95 Mbps    130.50 Mbps    Clouvider Ltd - Frankfurt am Main 
 Warsaw, PL       270.94 ms   0.0%    654.38 Mbps    135.70 Mbps    Play - Warszawa 
 Bucharest, RO    280.08 ms   0.0%    96.94 Mbps     139.26 Mbps    Digi        
 Moscow, RU       FAILED                                                        

 Jeddah, SA       248.25 ms   0.0%    467.31 Mbps    142.09 Mbps    Saudi Telecom Company 
 Dubai, AE        213.88 ms   N/A     797.77 Mbps    356.23 Mbps    e& UAE - Dubai 
 Istanbul, TR     255.01 ms   0.0%    489.64 Mbps    117.31 Mbps    Turkcell - Istanbul 
 Tehran, IR       FAILED                                                        
 Cairo, EG        270.29 ms   0.0%    646.30 Mbps    93.46 Mbps     Telecom Egypt - Cairo 

 Tokyo, JP        FAILED                                                        
 Shanghai, CU-CN  58.24 ms    N/A     548.83 Mbps    189.42 Mbps    China Unicom 5G - Shanghai 
 Hong Kong, CN    56.64 ms    N/A     523.22 Mbps    30.38 Mbps     Misaka Network, Inc. - Hong Kong 
 Singapore, SG    68.27 ms    0.0%    990.04 Mbps    706.15 Mbps    ViewQwest - Singapore 
 Jakarta, ID      78.17 ms    0.0%    940.75 Mbps    739.29 Mbps    PT Solnet Indonesia - Jakarta 

 Sydney, AU       139.80 ms   0.0%    185.78 Mbps    158.97 Mbps    Aussie Broadband - Sydney 
---------------------------------------------------------------------------
 Avg DL Speed       : 425.51 Mbps
 Avg UL Speed       : 317.13 Mbps

 Total DL Data      : 15.01 GB
 Total UL Data      : 10.37 GB
 Total Data         : 25.38 GB
---------------------------------------------------------------------------
 Duration           : 13 min 8 sec
 System Time        : 06/03/2026 - 15:19:53 CST
 Total Script Runs  : 520466
---------------------------------------------------------------------------
 Result             : https://result.nws.sh/r/1772781594_O8BNV9_GLOBAL.txt
---------------------------------------------------------------------------

2. IP Quality

IPQuality 
bash ‹(curl -sL https://Check. Place) -I

Streaming Unlock 
bash <(curl -L -s check.unlock.media)

Common IP Database Checks 
export noninteractive=true && curl -L https://raw.githubusercontent.com/oneclickvirt/ecs/master/goecs.sh -o goecs.sh && chmod +x goecs.sh && ./goecs.sh install && goecs

--------------------------------------IP Quality Check--------------------------------------
The following are database IDs; results include the corresponding source database IDs
ipinfo Database  [0] | scamalytics Database [1] | virustotal Database   [2] | abuseipdb Database   [3] | ip2location Database    [4]
ip-api Database  [5] | ipwhois Database     [6] | ipregistry Database   [7] | ipdata Database      [8] | db-ip Database          [9]
ipapiis Database [A] | ipapicom Database    [B] | bigdatacloud Database [C] | dkly Database        [D] | ipqualityscore Database [E]
ipintel Database [F] | ipfighter Database   [G] | fraudlogix Database   [H] | cloudflare Database  [I] |
IPv4:
Security Score:
Trust Score(higher is better): 100 [8] 
VPN Score(lower is better): 0 [8] 
Proxy Score(lower is better): 0 [8] 
Community Votes - Harmless: 0 [2] 
Community Votes - Malicious: 0 [2] 
Threat Score(lower is better): 0 [8]
Fraud Score(lower is better): 0 [E] 
Abuse Score(lower is better): 0 [3] 
ASN Abuse Score(lower is better): 0.0019 (Low) [A] 
Company Abuse Score(lower is better): 0.0002 (Very Low) [A] 
Threat Level: low [9 B] 
Traffic Share: Human(higher is better)39% [I] Bot(lower is better)60% [I]
Blacklist Record Statistics (number of blacklist sites with records):
Harmless Records: 0 [2]  Malicious Records: 0 [2]  Suspicious Records: 0 [2]  No-record Count: 94 [2] 
Security Info:
Usage Type: hosting [0 3 7 C] business [8 9 A]
Company Type: business [A] hosting [0 7]
Browser Type: Mainstream52% Other47% [I] 
Device Type: Desktop67% Mobile32% Other0% [I] 
OS Type: Mainstream98% Other1% [I] 
Is Cloud Provider: Yes [7 D] 
Is Data Center: Yes [0 C] No [5 8 A G]
Is Mobile Device: Yes [E] No [5 A C G]
Is Proxy: Yes [G] No [0 4 5 7 8 9 A B C D E]
Is VPN: No [0 7 A C D E G] 
Is Tor: No [0 3 7 8 A B C D E] 
Is Tor Exit: No [7 D]
Is Web Crawler: No [9 A B E] 
Is Anonymous: No [7 8 D] 
Is Attacker: No [7 8 D] 
Is Abuser: No [7 8 A C D E] 
Is Threat: No [7 8 C D] 
Is Relay: No [0 7 8 C D] 
Is Bogon: No [7 8 A C D] 
Is Bot: No [E] 
DNS Blacklist: 309(Total_Check) 0(Clean) 11(Blacklisted) 21(Other)
iplark Check Score 
Test Site: iplark.com
Test Time: 2026-03-06 21:30

3. Machine Performance

HardwareQuality 
bash ‹(curl -sL https://Check. Place) -I

YABS 
curl -sL https://yabs.sh | bash -s -- -5 -i

# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #
#              Yet-Another-Bench-Script              #
#                     v2025-04-20                    #
# https://github.com/masonr/yet-another-bench-script #
# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #

Fri Mar  6 07:18:35 PM CST 2026

Basic System Information:
---------------------------------
Uptime     : 0 days, 23 hours, 29 minutes
Processor  : AMD EPYC 7B13 64-Core Processor
CPU cores  : 1 @ 2249.998 MHz
AES-NI     : ✔ Enabled
VM-x/AMD-V : ✔ Enabled
RAM        : 1.9 GiB
Swap       : 0.0 KiB
Disk       : 19.5 GiB
Distro     : Debian GNU/Linux 13 (trixie)
Kernel     : 6.12.63+deb13-cloud-amd64
VM Type    : KVM
IPv4/IPv6  : ✔ Online / ❌ Offline

IPv4 Network Information:
---------------------------------
ISP        : Sakura Link Limited
ASN        : AS49304 SAKURA LINK LIMITED
Host       : Kdata
Location   : Suwon, Gyeonggi-do (41)
Country    : South Korea

fio Disk Speed Tests (Mixed R/W 50/50) (Partition /dev/sda1):
---------------------------------
Block Size | 4k            (IOPS) | 64k           (IOPS)
  ------   | ---            ----  | ----           ---- 
Read       | 47.81 MB/s   (11.9k) | 522.38 MB/s   (8.1k)
Write      | 47.85 MB/s   (11.9k) | 525.13 MB/s   (8.2k)
Total      | 95.67 MB/s   (23.9k) | 1.04 GB/s    (16.3k)
           |                      |                     
Block Size | 512k          (IOPS) | 1m            (IOPS)
  ------   | ---            ----  | ----           ---- 
Read       | 2.03 GB/s     (3.9k) | 2.61 GB/s     (2.5k)
Write      | 2.14 GB/s     (4.1k) | 2.79 GB/s     (2.7k)
Total      | 4.17 GB/s     (8.1k) | 5.41 GB/s     (5.2k)

Geekbench 5 Benchmark Test:
---------------------------------
Test            | Value                         
                |                               
Single Core     | 650                           
Multi Core      | 655                           
Full Test       | https://browser.geekbench.com/v5/cpu/24161272

YABS completed in 5 min 46 sec

4. Other

About the Tests

"100TB KR-Premium-SC 1GB (AMD)" was provided by the provider; the other machines used in this test were purchased at my own expense. Results may be time-sensitive.

Kernel parameters of the test machines (/etc/sysctl.conf) are as follows:

fs.file-max = 6815744
net.ipv4.tcp_no_metrics_save=1
net.ipv4.tcp_ecn=0
net.ipv4.tcp_frto=0
net.ipv4.tcp_mtu_probing=0
net.ipv4.tcp_rfc1337=0
net.ipv4.tcp_sack=1
net.ipv4.tcp_fack=1
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_adv_win_scale=1
net.ipv4.tcp_moderate_rcvbuf=1
net.core.rmem_max=33554432
net.core.wmem_max=33554432
net.ipv4.tcp_rmem=4096 87380 33554432
net.ipv4.tcp_wmem=4096 16384 33554432
net.ipv4.udp_rmem_min=8192
net.ipv4.udp_wmem_min=8192
net.ipv4.ip_forward=1
net.ipv4.conf.all.route_localnet=1
net.ipv4.conf.all.forwarding=1
net.ipv4.conf.default.forwarding=1
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
net.ipv6.conf.all.forwarding=1
net.ipv6.conf.default.forwarding=1
Acknowledgements

Thanks to the administrators and volunteers of Haoyong Aiyong and Yaoyao Leading for providing public-interest speed test services; thanks to itdog.cn and iplark.com and the authors of the test scripts

After writing so much, I am curious: do forum friends really need Korea optimization? xhj002

🔔 Thanks for reading this far. You can subscribe to my channel to receive reminders for new NS reviews.