Capture The Flag servers

83 measured server(s) with the Capture The Flag sub-topic, ranked by real members. Browse topics →

Server	Members	Online	Active
1 CTFlearn	12,104	1,009	8.3%
2 404 CTF	4,656	911	19.6%
3 VishwaCTF	4,045	221	5.5%
4 TagPro	3,763	248	6.6%
5 Real World CTF	3,754	307	8.2%
6 UTCTF 2026	3,446	519	15.1%
7 idekCTF	3,239	595	18.4%
8 b01lersCTF	3,148	561	17.8%
9 TFC CTF	2,976	537	18.0%
10 UTPugs	2,848	381	13.4%
11 corCTF	2,756	342	12.4%
12 HSCTF	2,647	196	7.4%
13 TSG CTF	2,568	279	10.9%
14 smileyCTF 2025	2,530	335	13.2%
15 GPN CTF 2026	2,479	543	21.9%
16 niteCTF '25	2,475	222	9.0%
17 rCTF	2,425	199	8.2%
18 R3CTF 2026	2,226	340	15.3%
19 House of Quake	2,146	348	16.2%
20 1753CTF	2,121	228	10.7%
21 JerseyCTF 🔒	1,989	228	11.5%
22 BCACTF	1,915	244	12.7%
23 jailCTF 2026	1,819	272	15.0%
24 N0PSctf	1,762	209	11.9%
25 Equinor CTF	1,670	303	18.1%
26 DamCTF	1,548	203	13.1%
27 TetCTF	1,435	148	10.3%
28 xCTFs	1,375	285	20.7%
29 Sieberrsec CTF	1,315	209	15.9%
30 WaniCTF	1,232	161	13.1%
31 wpictf	1,188	44	3.7%
32 DaVinciCTF	1,159	150	12.9%
33 UnitedCTF	1,107	187	16.9%
34 RACTF	1,071	84	7.8%
35 squ1rrel CTF 2026	1,052	155	14.7%
36 PearlCTF	1,000	97	9.7%
37 SwampCTF	961	117	12.2%
38 BH CTF	745	92	12.3%
39 Crate-CTF	661	123	18.6%
40 SillyCTF 2	576	76	13.2%
41 CTF 2: Last Laugh edition	566	88	15.5%
42 Pwn2Win CTF	560	58	10.4%
43 X Series CTF	536	66	12.3%
44 07CTF	535	60	11.2%
45 MapnaCTF	506	49	9.7%
46 FOOBAR CTF	486	24	4.9%
47 SharkyCTF	481	21	4.4%
48 Summit CTF	441	57	12.9%
49 CTF.SG CTF	437	55	12.6%
50 Aero CTF Archive	379	41	10.8%
51 Pwn2Play CTF	366	42	11.5%
52 VuwCTF	354	49	13.8%
53 noxCTF	347	9	2.6%
54 ZINC CTF	323	16	5.0%
55 TUCTF - 2024	321	50	15.6%
56 SKOPEIN - CTF 2026 - Le Caire, nid d’espions	312	33	10.6%
57 ToH CTF	308	42	13.6%
58 upCTF	306	50	16.3%
59 Plfanzen CTF	288	69	24.0%
60 K-CTF	270	97	35.9%
61 BjörnCTF	259	35	13.5%
62 CTF GRSU	244	32	13.1%
63 SnappCTF	244	3	1.2%
64 FMCTF	238	27	11.3%
65 Donjon CTF	219	18	8.2%
66 Deerhack 2024	197	6	3.0%
67 PwnThyBytes CTF 2019	191	10	5.2%
68 s4ctf	179	9	5.0%
69 WEC CTF 21	174	6	3.4%
70 C2C CTF 2021	163	11	6.7%
71 EasyCTF	160	29	18.1%
72 Universal CTF	154	25	16.2%
73 Expert CTF	123	18	14.6%
74 Sapling CTF 2023	120	16	13.3%
75 Fweefwop CTF 2021	115	5	4.3%
76 GZ::CTF	103	20	19.4%
77 CYCTF2023	98	4	4.1%
78 FE-CTF	95	7	7.4%
79 InfoSec CTF	94	1	1.1%
80 Corona CTF	89	16	18.0%
81 2024 Layer7 CTF	68	15	22.1%
82 WatchList CTF	37	7	18.9%
83 Captchafault CTF	22	2	9.1%