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	12,100	675	5.6%
2 404 CTF	4,621	288	6.2%
3 VishwaCTF	4,020	208	5.2%
4 TagPro	3,763	331	8.8%
5 Real World CTF	3,748	299	8.0%
6 UTCTF 2026	3,426	361	10.5%
7 TFC CTF	3,304	331	10.0%
8 idekCTF	3,214	328	10.2%
9 b01lersCTF	3,131	324	10.3%
10 UTPugs	2,852	368	12.9%
11 corCTF	2,742	310	11.3%
12 HSCTF	2,640	186	7.0%
13 TSG CTF	2,556	211	8.3%
14 smileyCTF 2025	2,511	244	9.7%
15 GPN CTF 2026	2,455	240	9.8%
16 niteCTF '25	2,447	181	7.4%
17 rCTF	2,421	166	6.9%
18 R3CTF 2026	2,204	218	9.9%
19 House of Quake	2,150	258	12.0%
20 1753CTF	2,108	244	11.6%
21 JerseyCTF 🔒	1,967	260	13.2%
22 BCACTF	1,888	202	10.7%
23 jailCTF 2026	1,793	194	10.8%
24 N0PSctf	1,748	181	10.4%
25 Equinor CTF	1,662	313	18.8%
26 DamCTF	1,532	192	12.5%
27 TetCTF	1,433	97	6.8%
28 xCTFs	1,406	275	19.6%
29 Sieberrsec CTF	1,309	199	15.2%
30 WaniCTF	1,222	193	15.8%
31 wpictf	1,185	43	3.6%
32 DaVinciCTF	1,150	129	11.2%
33 UnitedCTF	1,138	207	18.2%
34 RACTF	1,072	88	8.2%
35 squ1rrel CTF 2026	1,042	151	14.5%
36 PearlCTF	997	105	10.5%
37 SwampCTF	950	108	11.4%
38 07CTF	785	88	11.2%
39 BH CTF	737	66	9.0%
40 Crate-CTF	667	144	21.6%
41 SillyCTF 2	565	73	12.9%
42 CTF 2: Last Laugh edition	562	70	12.5%
43 Pwn2Win CTF	558	61	10.9%
44 X Series CTF	532	65	12.2%
45 MapnaCTF	502	35	7.0%
46 FOOBAR CTF	485	26	5.4%
47 SharkyCTF	480	17	3.5%
48 CTF.SG CTF	438	74	16.9%
49 Summit CTF	437	58	13.3%
50 Aero CTF Archive	379	50	13.2%
51 Pwn2Play CTF	366	32	8.7%
52 VuwCTF	350	44	12.6%
53 noxCTF	347	7	2.0%
54 ZINC CTF	323	18	5.6%
55 TUCTF - 2024	318	44	13.8%
56 ToH CTF	304	51	16.8%
57 SKOPEIN - CTF 2026 - Le Caire, nid d’espions	303	31	10.2%
58 upCTF	301	61	20.3%
59 Plfanzen CTF	286	60	21.0%
60 WatchList CTF	276	42	15.2%
61 BjörnCTF	271	38	14.0%
62 K-CTF	259	59	22.8%
63 SnappCTF	244	1	0.4%
64 CTF GRSU	244	22	9.0%
65 FMCTF	239	21	8.8%
66 Donjon CTF	217	8	3.7%
67 Deerhack 2024	196	5	2.6%
68 PwnThyBytes CTF 2019	191	11	5.8%
69 s4ctf	179	6	3.4%
70 WEC CTF 21	174	7	4.0%
71 C2C CTF 2021	163	14	8.6%
72 EasyCTF	160	24	15.0%
73 Universal CTF	150	8	5.3%
74 Expert CTF	123	21	17.1%
75 Sapling CTF 2023	119	15	12.6%
76 Fweefwop CTF 2021	115	6	5.2%
77 GZ::CTF	105	20	19.0%
78 CYCTF2023	97	10	10.3%
79 FE-CTF	95	24	25.3%
80 InfoSec CTF	94	2	2.1%
81 Corona CTF	89	8	9.0%
82 2024 Layer7 CTF	68	16	23.5%
83 Captchafault CTF	22	3	13.6%